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Boulder Opal
Boulder Opal
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Nuummite
Nuummite
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Boulder Opal
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1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.4 Solubility
Not Available
Not Available
1.5 Durability
Not Available
Not Available
0.1 Specific Gravity
1.98-2.253.18-3.37
Amber ▶ ⊕
1 7.18
1.5 Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal
1.6 Cleavage
Not Available
Perfect on 210
1.7 Mohs Hardness
5-6.55.5-6
Amber ▶ ⊕
2 10
1.13 Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
Not Available

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