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Thulite
Thulite

Crystal Opal
Crystal Opal



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Thulite
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Crystal Opal
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
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3.1
Uneven, Conchoidal
Perfect {010} imperfect {100}
6-7
Ca2Al3(SiO4)3(OH)
 
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1.97-2.22
Conchoidal
None
5.5-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.