Jasper - Wikipedia
https://en.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 item… Crystal system: Hexagonal Crystal class: Quartz (Chalcedony) Mohs scale hardness: 6.5-7
Crystal system: Hexagonal
Crystal class: Quartz (Chalcedony)
Mohs scale hardness: 6.5-7
DA: 20 PA: 96 MOZ Rank: 32