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Langbeinite
Langbeinite

Riebeckite
Riebeckite



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Langbeinite
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Riebeckite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
Slowly dissolves in water
-
-9999
Conchoidal
None
3.5-4
K2Mg2(SO4)3
 
Brittle
-
-
3.28-3.44
Uneven, Splintery
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
5.0-6.0
Na2Fe2+3Fe3+2Si8O22(OH)2