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Dravite
Chlorite group
Chlorite group and Dravite Physical Properties


Physical Properties
Tenacity
-  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
3.03-3.18  
2.6-3.3  
Fracture
Uneven, Irregular, Conchoidal  
Lamellar  
Cleavage
{???} Indistinct  
Perfect 001  
Mohs Hardness
7-7.5  
2-2.5  
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)  
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6  
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