Opal Company Profile

Aggregated data from the web about Opal

Company Name	Opal
Snippet
Color	Colorless, white, yellow, red, orange, green, brown, black, blue, pink
Luster	Subvitreous to waxy[1]
Streak	White
Density	2.09
Category	Mineraloid
Cleavage	None[1]
Fracture	Conchoidal to uneven[1]
References	[2][3]
Solubility	hot salt water, bases, methanol, humic acid, hydrofluoric acid
Diaphaneity	opaque, translucent, transparent
Pleochroism	None[1]
Birefringence	none[1]
Crystal habit	Irregular veins, in masses, in nodules
Polish luster	Vitreous to resinous[1]
Crystal system	Amorphous[1]
Refractive index	7000145000000000000♠1.450+0.020−0.080Mexican opal may read as low as 1.37, but typically reads 1.42–1.43[1]
Specific gravity	7000215000000000000♠2.15+0.08−0.90[1]
Absorption spectra	green stones: 660 nm, 470 nm cutoff[1]
Optical properties	Single refractive, often anomalous double refractive due to strain[1]
Diagnostic features	darkening upon heating
Mohs scale hardness	5.5–6[1]
Formula(repeating unit)	Hydrated silica. SiO2·nH2O
Ultraviolet fluorescence	black or white body color: inert to white to moderate light blue, green, or yellow in long and short wave, may also phosphoresce, common opal: inert to strong green or yellowish green in long and short wave, may phosphoresce; fire opal: inert to moderate greenish brown in long and short wave, may phosphoresce[1]

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