Search Results - Jasper
Jasper
![Jasper outcrop, [[Bucegi Mountains, Romania]]](https://upload.wikimedia.org/wikipedia/commons/7/7c/Jasper_outcrop_in_the_Bucegi_Mountains.jpg)
Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron(III) inclusions. Jasper breaks with a smooth surface and is used for ornamentation or as a gemstone. It can be highly polished and is used for items such as vases, seals, and snuff boxes. The density of jasper is typically 2.5 to 2.9 g/cm3. Jaspillite is a banded-iron-formation rock that often has distinctive bands of jasper.
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