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Definition: a mineral, an amorphous form of silica, with some water of hydration, found in many varieties and colors, including a form that is milky white.

Luster: Vitreous to sub-vitreous common opal is frequently resinous

Color: it varies accross the visible spectrum

Hardness: 5-7

Diaphaneity: transparent to opaque

Fracture: Conchoidal

Streak: white

Cleavage: no cleavage

Crystalline structure: it does not crystallize normally

Extra Credit:

Where is it found? Australia

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