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Geology:
Rocks, Minerals & Ores

Mineral Sequence in the Cady Mountains

Chalcedony (var. Jasper)

SiO2
Cady Mountains, Mojave Desert, CA


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Mineral Sequence in the Cady Mountains

Chalcedony (var. Jasper)

Tectosilicates; a variety of quartz (silicon dioxide), often with some iron and aluminum

Color and Luster: clear red to brownish red(Var. carnelian and sard, carnelian and sard in layers (Var. onyx), bright green with spots of red(Var. heliotrope and bloodstone), variegated(Var. agate), banded, agate with moss- or tree- like inclusions(Var. moss agate), apple-green(Var. chrysoprase), variegated and mottled red, yello, and brown(Var. jasper), whitish, dull gray, smoky brown to black(Var. flint), also white to gray, brown, blue, and black; waxy luster, vitreous, dull; streak white

Hardness:7

Cleavage: None

Fracture: Conchoidal, brittle to tough

Crystals: None; chalcedony is a microcrystalline variety of quartz usually occuring as crusts with botyroidal or mammillary forms; or compact, banded

The Audubon Society Field Guide to North American Rocks and Minerals

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