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Siderite
Siderite
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Topaz
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
-
-
3.83-3.89
Uneven, Conchoidal
Perfect on {01 1 1}
3.5-4.5
Fe2+ CO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
-
-
-
3.49-3.57
Subconchoidal, Uneven, Conchoidal
[001] Perfect
8
Al2SiO4(F,OH)2