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Charoite
Charoite

Hercynite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.54-2.78
Conchoidal
Good in three directions
5-6
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
-
-
-
4.39
Uneven
{111} Indistinct, {111} Indistinct, {111} Indistinct
7.5-8
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)