Grafic Jasper

  • Crystal system: Hexagonal
  • Crystal class: Quartz (Chalcedony)
  • Colour: Most commonly red, but may be yellow, brown, green or (rarely) blue
  • Mohs scale hardness: 6.5-7
  • Luster: Vitreous
  • Diaphaneity: Opaque
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Description

Jasper, an aggregate of microgranular quartz and/or 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 gravity of jasper is typically 2.5 to 2.9. A green variety with red spots, known as heliotrope, is one of the traditional birthstones for March. Jaspillite is a banded-iron-formation rock that often has distinctive bands of jasper.

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