Jasper - Wikipedia
https://en.m.wikipedia.org/wiki/Jasper
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 specific gravityof jasper is t… Crystal class: Quartz (Chalcedony) Crystal system: Hexagonal Mohs scale hardness: 6.5–7
Crystal class: Quartz (Chalcedony)
Crystal system: Hexagonal
Mohs scale hardness: 6.5–7
DA: 52 PA: 41 MOZ Rank: 85