Dolomite or [CaMg(CO3)2] is a sedimentary rock abundantly found in Precambrian carbonate rocks with additional microbial structures attached to it. Talking about its physical appearance, pure dolomite resembles Micrite. It is produced when a preexisting carbonate rock is chemically altered. However, it is a rare site in the carbonate background today.
ORIGIN OF DOLOMITE
The origin of dolomite is not accurately known to geologists around the world. Some believe it is a primary origin precipitated directly from sea water while some says it is a secondary origin which happens to be a product of post-depositional changes of calcitic carbonates.
However, it is interesting to know that dolomitic rocks were once found as limestones. Owing to this discovery, most scientists interpret that most dolomite rocks were formed through pressure solution. Well, what happens in pressure solution is that a carbonate rock dissolves under pressure as a result of deep burial or tectonic squeezing. If that was the case, many geologists believe that modern day limestone too is undergoing dolomitization, especially those in tidal flat environments.
Dolomite is one of the major constituents of dolostones and dolomite marbles. Whatsoever, the origin of dolomite-rich rocks in marine aspect is still an unresolved petrogenesis. Today, it is manufactured and exported in the market for different purposes.
PROBLEMS RELATED TO DOLOMITIC ROCKS
- Geologists find it difficult to determine the degree of dolomitization of a rock. They do it by making it react with dilute HCl acid.
- Here is another fact about dolomitic rock. Not all of them are equally or uniformly dolomitic. Geologists normally test different parts of the rock with dilute HCl acid under a microscope.
- Very minute observation is required to determine the calcitic parent of any dolomitic rock. At times it so happens that the original texture is partially destroyed when dolomitization recrystallizes the calcite.
FACTS ABOUT DOLOMITE
- Dolomite is a type of limestone used to manufacture magnesium salts.
- It is coined after a French mineralogist, Deodat de Dolomieu.
- Very rare pink varieties of dolomite are found in Congo, Africa.
- It is used in the medical industry as a laxative to make magnesia.
- It is found in dolomite beds and helps in the manufacture of cement, pavement, and concrete.
- It is used as a substitute for calcium and magnesium.
- It decreases acid levels in the soil.
- It is a rare occurrence as metamorphic rock.
- It is used in the production of steel and manufacturing of bricks.
- It is not formed on the Earth’s surface rather underground in ancient rocks.