Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Dolomite shopping experience:
1. Compare - without doubt the biggest advantage that the Dolomite offers shoppers today is the ability to compare thousands of Dolomite at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Dolomite? Wrong! If the Dolomite is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Dolomite then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Dolomite? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Dolomite and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Dolomite wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Dolomite then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Dolomite site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Dolomite, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Dolomite, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
Dolomite (International Phonetic Alphabet: ) is the name of a
sedimentary carbonate rock and a
mineral, both composed of calcium magnesium
carbonate CaMg(CO3)2 found in crystals.
Dolomite rock (also dolostone) is composed predominantly of the mineral dolomite.
Limestone that is partially replaced by dolomite is referred to as dolomitic limestone, or in old U.S. geologic literature as
magnesian limestone.Dolomite was first described in 1791 as the rock by the French people natural history and
geologist, Déodat Gratet de Dolomieu (1750-1801) for exposures in the Dolomite Alps of northern Italy.
Properties
The mineral dolomite crystallizes in the trigonal system. It forms white, gray to pink, commonly curved crystals, although it is usually massive. It has physical properties similar to those of the mineral
calcite, but does not rapidly dissolve or effervesce (fizz) in dilute
hydrochloric acid. The Mohs hardness is 3.5 to 4 and the
specific gravity is 2.85.
Refractive index values are nω = 1.679 - 1.681 and nε = 1.500.
Crystal twinning is common. A solid solution series exists between dolomite and
iron rich ankerite. Small amounts of iron in the structure give the crystals a yellow to brown tint. Manganese substitutes in the structure also up to about three percent MnO. A high manganese content gives the crystals a rosy pink color noted in the image above. A series with the manganese rich
kutnohorite may exist.
Lead and zinc also substitute in the structure for magnesium.
Formation
Vast deposits are present in the geological record, but the mineral is relatively rare in modern environments. However, laboratory synthesis of stoichiometric dolomite has been carried out only at temperatures of greater than 100 degrees Celsius, conditions typical of burial in sedimentary basins - even though much dolomite in the rock record appears to have formed in low-temperature conditions. The high temperature is likely to speed up the movement of calcium and magnesium ions so that they can find their places in the ordered structure within a reasonable amount of time. This suggests that the lack of dolomite that is being formed today is likely due to kinematic factors.
Modern dolomite does occur as a precipitating mineral in specialized environments on the surface of the earth today. In the 1950s and 60s, dolomite was found to be forming in highly saline lakes in the Coorong region of
South Australia. Dolomite crystals also occur in deep-sea sediments, where organic matter content is high. This dolomite is termed "organogenic" dolomite.
Recent research has found modern dolomite formation under
Hypoxia (environmental) conditions in
Supersaturation saline
lagoons along the
Rio de Janeiro coast of Brazil, namely, Lagoa Vermelha and Brejo do Espinho. One interesting reported case was the formation of dolomite in the kidneys of a Dalmatian (dog) dog. This was believed to be due to chemical processes triggered by bacteria. Dolomite has been speculated to develop under these conditions with the help of
sulfate-reducing bacteria. This joins other research in pointing out many new interesting links between large-scale geology and small-scale
microbiology (see geomicrobiology).
The actual role of bacteria in the low-temperature formation of dolomite remains to be demonstrated. The specific mechanism of dolomitization, involving sulfate-reducing bacteria, has not yet been demonstrated.
Dolomite appears to form in many different types of environment and can have varying structural, textural and chemical characteristics. Some researchers have stated "there are dolomites and dolomites," meaning that there may not be one single mechanism by which dolomite can form. Much modern dolomite differs significantly from the bulk of the dolomite found in the rock record, leading researchers to speculate that environments where dolomite formed in the geologic past differ significantly from those where it forms today.
Reproducible laboratory syntheses of dolomite (and magnesite) leads first to the initial precipitation of a metastable "precursor" (such as magnesium calcite), to be changed gradually into more and more of the stable phase (such as dolomite or magnesite) during periodical intervals of dissolution and reprecipitation. The general principle governing the course of this irreversible
geochemistry reaction has been coined Ostwald's step rule.
Uses
Dolomite is used as an
ornamental stone, as a raw material for the manufacture of cement, and as a source of
magnesium oxide. It is an important petroleum oil reservoir rock, and serves as the host rock for large strata-bound Mississippi Valley-Type (MVT) ore deposits of
base metals (that is, readily oxidized metals) such as lead, zinc, and
copper. Where
calcite limestone is uncommon or too costly, dolomite is sometime used in its place as a
flux (metallurgy) (impurity remover) for the smelting of iron and steel.
In horticulture, dolomite and dolomitic limestone are added to soils and soilless potting mixes to lower their acidity ("sweeten" them). Home and container gardening are common examples of this use.
As nutritional supplement
In nutrition, dolomite is sold sometimes as a
dietary supplement on the assumption that it should make a good simultaneous source of the two important elemental nutrients
calcium and magnesium. However, since dolomites from Mississippi Valley-Type ore regions such as the Old
Lead Belt and New Lead Belt in southeastern Missouri often include significant levels of lead and other toxic elements, users should always verify that such dolomite supplements are from non-ore regions of the world before ingesting them. Further, laboratory experiments conducted at the University of Alberta demonstrate that dolomite is practically insoluable in stomach acid and is eliminated from the body before significant magnesium or calcium can be absorbed. A far safer strategy is to avoid using dolomite as a supplement altogether, and instead taking equivalent amounts of
milk of magnesia and calcium supplements. The chemical processes used to create such individual supplements effectively eliminate the risk of ingesting the toxic metals often associated with raw dolomite.
See also
- List of minerals
- Evaporite
References
- Deer, W. A., R. A. Howie and J. Zussman (1966) An Introduction to the Rock Forming Minerals, Longman, pp. 489 - 493 ISBN 0-582-44210-9
- Webmineral
- Mindat data
- Mineral galleries
- Role of Sulfate Reducing Bacteria During Microbial Dolomite Precipitation as Deduced from Culture Experiments
- Low temperature formation of dolomite and magnesite
Dolomite (International Phonetic Alphabet: ) is the name of a
sedimentary carbonate rock and a
mineral, both composed of calcium
magnesium carbonate CaMg(CO3)2 found in
crystals.
Dolomite rock (also dolostone) is composed predominantly of the mineral dolomite. Limestone that is partially replaced by dolomite is referred to as dolomitic limestone, or in old U.S. geologic literature as
magnesian limestone.Dolomite was first described in 1791 as the rock by the
French people natural history and geologist,
Déodat Gratet de Dolomieu (1750-1801) for exposures in the
Dolomite Alps of northern
Italy.
Properties
The mineral dolomite crystallizes in the trigonal system. It forms white, gray to pink, commonly curved crystals, although it is usually massive. It has physical properties similar to those of the mineral calcite, but does not rapidly dissolve or effervesce (fizz) in dilute
hydrochloric acid. The
Mohs hardness is 3.5 to 4 and the
specific gravity is 2.85. Refractive index values are nω = 1.679 - 1.681 and nε = 1.500. Crystal twinning is common. A solid solution series exists between dolomite and
iron rich
ankerite. Small amounts of iron in the structure give the crystals a yellow to brown tint. Manganese substitutes in the structure also up to about three percent MnO. A high manganese content gives the crystals a rosy pink color noted in the image above. A series with the manganese rich
kutnohorite may exist.
Lead and
zinc also substitute in the structure for magnesium.
Formation
Vast deposits are present in the geological record, but the mineral is relatively rare in modern environments. However, laboratory synthesis of stoichiometric dolomite has been carried out only at temperatures of greater than 100 degrees Celsius, conditions typical of burial in sedimentary basins - even though much dolomite in the rock record appears to have formed in low-temperature conditions. The high temperature is likely to speed up the movement of calcium and magnesium ions so that they can find their places in the ordered structure within a reasonable amount of time. This suggests that the lack of dolomite that is being formed today is likely due to kinematic factors.
Modern dolomite does occur as a precipitating mineral in specialized environments on the surface of the earth today. In the 1950s and 60s, dolomite was found to be forming in highly saline lakes in the Coorong region of South Australia. Dolomite crystals also occur in deep-sea sediments, where organic matter content is high. This dolomite is termed "organogenic" dolomite.
Recent research has found modern dolomite formation under
Hypoxia (environmental) conditions in Supersaturation saline lagoons along the
Rio de Janeiro coast of
Brazil, namely, Lagoa Vermelha and Brejo do Espinho. One interesting reported case was the formation of dolomite in the kidneys of a Dalmatian (dog) dog. This was believed to be due to chemical processes triggered by bacteria. Dolomite has been speculated to develop under these conditions with the help of sulfate-reducing bacteria. This joins other research in pointing out many new interesting links between large-scale geology and small-scale microbiology (see geomicrobiology).
The actual role of bacteria in the low-temperature formation of dolomite remains to be demonstrated. The specific mechanism of dolomitization, involving sulfate-reducing bacteria, has not yet been demonstrated.
Dolomite appears to form in many different types of environment and can have varying structural, textural and chemical characteristics. Some researchers have stated "there are dolomites and dolomites," meaning that there may not be one single mechanism by which dolomite can form. Much modern dolomite differs significantly from the bulk of the dolomite found in the rock record, leading researchers to speculate that environments where dolomite formed in the geologic past differ significantly from those where it forms today.
Reproducible laboratory syntheses of dolomite (and
magnesite) leads first to the initial precipitation of a metastable "precursor" (such as magnesium calcite), to be changed gradually into more and more of the stable phase (such as dolomite or magnesite) during periodical intervals of dissolution and reprecipitation. The general principle governing the course of this irreversible
geochemistry reaction has been coined Ostwald's step rule.
Uses
Dolomite is used as an ornamental stone, as a raw material for the manufacture of cement, and as a source of
magnesium oxide. It is an important
petroleum oil reservoir rock, and serves as the host rock for large strata-bound Mississippi Valley-Type (MVT)
ore deposits of base metals (that is, readily oxidized metals) such as
lead, zinc, and copper. Where
calcite limestone is uncommon or too costly, dolomite is sometime used in its place as a flux (metallurgy) (impurity remover) for the smelting of iron and steel.
In horticulture, dolomite and dolomitic limestone are added to soils and soilless potting mixes to lower their acidity ("sweeten" them). Home and container gardening are common examples of this use.
As nutritional supplement
In nutrition, dolomite is sold sometimes as a
dietary supplement on the assumption that it should make a good simultaneous source of the two important elemental nutrients calcium and
magnesium. However, since dolomites from
Mississippi Valley-Type ore regions such as the Old Lead Belt and New Lead Belt in southeastern
Missouri often include significant levels of lead and other toxic elements, users should always verify that such dolomite supplements are from non-ore regions of the world before ingesting them. Further, laboratory experiments conducted at the University of Alberta demonstrate that dolomite is practically insoluable in stomach acid and is eliminated from the body before significant magnesium or calcium can be absorbed. A far safer strategy is to avoid using dolomite as a supplement altogether, and instead taking equivalent amounts of milk of magnesia and
calcium supplements. The chemical processes used to create such individual supplements effectively eliminate the risk of ingesting the toxic metals often associated with raw dolomite.
See also
- List of minerals
- Evaporite
References
- Deer, W. A., R. A. Howie and J. Zussman (1966) An Introduction to the Rock Forming Minerals, Longman, pp. 489 - 493 ISBN 0-582-44210-9
- Webmineral
- Mindat data
- Mineral galleries
- Role of Sulfate Reducing Bacteria During Microbial Dolomite Precipitation as Deduced from Culture Experiments
- Low temperature formation of dolomite and magnesite
Dolomite - Wikipedia, the free encyclopedia
Dolomite (pronounced /ˈdɒləmaɪt/) is the name of a sedimentary carbonate rock and a mineral, both composed of calcium magnesium carbonate Ca Mg (C O 3) 2 found in crystals.
The Triumph Dolomite Club - Discussion Forum • Index page
The Triumph Dolomite Club - Discussion Forum. The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s. Skip to content
The Triumph Dolomite Homepage - The Triumph Dolomite Club's Official ...
The Triumph Dolomite Homepage The Official Website of The Triumph Dolomite Club
Triumph Dolomite Club - Valuations
Valuations We often get calls from people asking us how much we think their car is worth.The club provides a free valuation service for members but this is for insurance purposes ...
Triumph Dolomite Parts Spares & Accessories - Rimmer Bros
Parts Spares and accessories for Triumphs MG Rover Land Rover Discovery Freelander Defender and Rover SD1
1975 Triumph Dolomite 1850
Please click on each thumbnail for details and a larger image
dolomite definition of dolomite in the Free Online Encyclopedia.
Encyclopedia article about dolomite. Information about dolomite in the Columbia Encyclopedia, Computer Desktop Encyclopedia, computing dictionary. dolomites, dolomite rock
Steetley Dolomite Limited
Home | Products | What's New | Personnel | Contact Us | OWA Whitwell | OWA Thrislington |
Dolomite Microfluidics
Dolomite is a world leader in Microfluidics, an emerging technology that is changing the future of instrument design. Microfluidics is a technology that enables small scale fluid ...
Triumph Dolomite & Sprint Club
Triumph Dolomite & Sprint Club. The TD & SC was set up in 1997 by a group of enthusiasts based in the Somerset area. We felt that no other club (neither then, nor now ...
