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Howlite
Howlite
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Sonolite
Sonolite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.45-2.58
Conchoidal
None
3-3.5
Ca 2B 5SiO 9(OH) 5Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
-
-
-
3.82-4.00
-
{???} Indistinct
5.5
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)

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Gems for Gemini » More

Gems for Gemini » More

Chrome Diopside
Chrome Diopside
Crystal Quartz
Crystal Quartz
Rhyolite
Rhyolite

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