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Hollandite
Hollandite
☒

Precious Opal
Precious Opal
☒



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Hollandite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
5.05
-
Distinct / Good, Prismatic
4-6
Ba(Mn++++,Mn++)8O16
 
-
-
-
1.98-2.25
Conchoidal
None
5-6.5
SiO 2 · nH 2OGemdat.org , Management Team (2012)

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Gibbsite
Gibbsite
Gaylussite
Gaylussite
Precious Opal
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Vanadinite
Precious Opal Vs Vanadinite
Precious Opal
Scorodite
Precious Opal Vs Scorodite

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