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Alexandrite

Tsarstone collectors guide


Moh's hardness scale

Moh's hardness scale
The most commonly used ten standard scale of relative hardness of minerals. The scale is expressed in numbers ranging from 1 through 10: (1) talc, (2) gypsum, (3) calcite, (4) fluorite, (5) apatite, (6) orthoclase, (7) quartz, (8) topaz, (9) corundum, (10) diamond.
Magma
Magma
m.alexandrite.net/chapters/glossary/magma.html
Metamorphic
Metamorphic
m.alexandrite.net/chapters/glossary/metamorphic.html
Metamorphic rock
Metamorphic rock
m.alexandrite.net/chapters/glossary/metamorphic-rock.html
Mica schist
Mica schist
m.alexandrite.net/chapters/glossary/mica-schist.html
Mineral
Mineral
m.alexandrite.net/chapters/glossary/mineral.html
Mineralogy
Mineralogy
m.alexandrite.net/chapters/glossary/mineralogy.html

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