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2. Dolomite (mineral) - Wikipedia

   en.wikipedia.org/wiki/Dolomite_(mineral)

   Dolomite (/ ˈ d ɒ l. ə ˌ m aɪ t, ˈ d oʊ. l ə-/) is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally CaMg(CO 3) 2. The term is also used for a sedimentary carbonate rock composed mostly of the mineral dolomite (see Dolomite (rock) ).

3. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   Mohs scale of mineral hardness; Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on ...

4. Mohs scale - Wikipedia

   en.wikipedia.org/wiki/Mohs_scale

   Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

5. Dolomite (rock) - Wikipedia

   en.wikipedia.org/wiki/Dolomite_(rock)

   Dolomite outcrops are recognized in the field by their softness (mineral dolomite has a Mohs hardness of 4 or less, well below common silicate minerals) and because dolomite bubbles feebly when a drop of dilute hydrochloric acid is dropped on it. This distinguishes dolomite from limestone, which is also soft but reacts vigorously with dilute ...

6. Serpentine subgroup - Wikipedia

   en.wikipedia.org/wiki/Serpentine_subgroup

   Mohs scale hardness: 2.5–6 (original) 3.5–4.0 ... such as calcite and dolomite. ... It has a hardness of 3.5–4 and its luster is greasy.

7. Tremolite - Wikipedia

   en.wikipedia.org/wiki/Tremolite

   Tremolite forms by metamorphism of sediments rich in dolomite and quartz, and occurs in two distinct forms, crystals and fibers. Tremolite forms a series with actinolite and ferro-actinolite. Pure magnesium tremolite is creamy white, but the color grades to dark green with increasing iron content. It has a hardness on Mohs scale of 5 to 6.

8. Soapstone - Wikipedia

   en.wikipedia.org/wiki/Soapstone

   Soapstone is relatively soft because of its high talc content—talc has a definitional value of 1 on the Mohs hardness scale. Softer grades may feel similar to soap when touched, hence the name. No fixed hardness is given for soapstone because the amount of talc it contains varies widely, from as little as 30% for architectural grades such as ...

9. Scheelite - Wikipedia

   en.wikipedia.org/wiki/Scheelite

   Mohs scale hardness: 4.5–5: Luster: ... the semi-precious stone marketed as 'blue scheelite' is actually a rock type consisting mostly of calcite and dolomite, with ...