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Dravite
Dravite
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Kutnohorite
Kutnohorite
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Kutnohorite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.03-3.18
Uneven, Irregular, Conchoidal
{???} Indistinct
7-7.5
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
 
Brittle
Soluble
-
3.12
Subconchoidal, Conchoidal
Perfect on {10 1 1}
3-4
Ca(Mn,Mg,Fe)(CO3)2