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Jasper

Jasper is an impure form of chalcedony quartz, usually with a deep red or brown color and vitreous luster. It is an extremely common mineral, and can be found across the world. As a quartz, it is composed of SiO2 with its color being attributed most often to iron (III) oxides. Jasper without any gemological value is known as chert.

Chemical Formula

SiO2

BirthStone Month

October

Gemstone Mineral

Quartz

Crystal Structure

Trigonal

Hardness

7.00

Specific Gravity

2.650

Double Refraction

1.540

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