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Tugtupite
Tugtupite

Franklinite
Franklinite



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Tugtupite
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Franklinite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.30-2.60
Uneven, Conchoidal
{111} Imperfect
5.5-6
Na 4AlBeSi 4O 12ClMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
-
-
-
5.05-5.22
Uneven
None
5.5-6
(Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)