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MOH's Hardness Scale:
In 1822, Friedrich
Moh, a German mineralogist devised a crude but practical method of comparing
hardness or scratch resistance of minerals. It has become universally known
as Moh's scale. More.. tables&Scales
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CALCITE
Named by Haidinger in 1845 after
a Greek root meaning to reduce a powder by heat ( also Latic Calx, burnt
lime ) More..
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MARBLE
Color white or grey but a wider range of
black, red and green occurs, often in streak and patches.
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DOLOMITE
Dolomite Named in 1791 after Deodat Guy
Silvain Tancrede Gratet de Dolomieu French Engineer and Mineralogist.
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TALC
Talc Mg3 Si4O10
(OH)2 the name has been in use since antiquity and is
derived from the Arabic.
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