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The mohs hardness scale measures a mineral s resistance to scratching.
Marble and gypsum hardnes. Cement makers look at lime rock as the chemical feedstock of greater or lesser purity and expense difference between gypsum and marblewhat is limestone and gypsum and marble mbokodoinnscoza. Being composed of calcite marble has a hardness of three on the mohs hardness scale. It can be scratched by all other materials. This scale has been a valuable tool in identifying minerals since 1812.
Mohs scale of mineral hardness is named after friedrich mohs a mineralogist mohs scale is ordered by hardness determined by which minerals can scratch other minerals. Find the traditional scale here and a chart of select gems ordered by hardness. Talc absolute hardness 1 gypsum absolute hardness 2. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster blackboard sidewalk chalk and drywall a massive fine grained white or lightly tinted variety of gypsum called alabaster has been used for sculpture by many cultures including.
According to the scale talc is the softest. Rocks are made up of one or more minerals. A german mineralogist by the name of friedrich mohs invented a scale of relative mineral hardness that has become known as the mohs scale. As a result marble is easy to carve and that makes it useful for producing sculptures and ornamental objects.
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate with the chemical formula caso 4 2h 2 o. Chalk is a compaction of tiny fossil seashells marble is a. It can scratch talc but not calcite which is even harder. The following are the ten standard minerals in the mohs scale.
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