The mineral calcite is a carbonate group, group V / B of the classification of Strunz. It is sometimes used synonymously with limestone, but it is incorrect as this is a rock than a mineral.
Its name comes from the Latin calx, meaning lime. It is the most stable mineral calcium carbonate, compared to the other two polymorphs with the same chemical formula but different crystal structure: the aragonite and vaterite, more volatile and soluble. Some habits of calcite
Calcite is very common and is widely distributed around the globe, it is estimated that approximately 4% by weight of the earth's crust of calcite. Presents a huge variety of shapes and colors.
is characterized by its relatively low hardness (3 on Mohs scale) and its high reactivity even weak acids such as vinegar, in addition to the aforementioned prominent division in many varieties, have been reported hundreds, depending on the impurities metal ions that can lead.
The best property to identify calcite is the acid test, because this mineral always produce effervescence with acids.
Source: Wikipedia and Mindat.
The samples were donated by our friend from Spain, in Cantabria where samples are extracted. Manager Jorge Araneda
Mineraland
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