Physical Properties

Properties

Physical Characteristics

Color

White, Light gray, Light yellow, Light Brown, Blue-Gray

Streak

White

Hardness

6 to 7

Transparency

Translucent

Luster

Vitreous

Cleavage

None

Fracture

Concoidal

Tenacity

Brittle

Other ID

-crystals exhibit a strong double refraction

-minerals can sometime be fluorescent white or cream color

-When heated up to a temp. of 350F, mineral can become clear and transparent (only occurs while at that temp.)

Chemical Properties

Cristobalite has a composition of Si02. It has a molecular weight of 60.08 gm. Cristobalite is completely oxide with a mass ratio of 46.74% being silica and 53.26% oxygen.