File:Jasper_outcrop_in_the_Bucegi_Mountains.jpg · Wikimedia Commons · See Wikimedia Commons
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.
Jasper is a colorful, opaque stone made primarily of quartz that breaks smoothly and can be polished to a shine, making it useful for decorative objects and jewelry. Its practical value lies in its durability and attractive appearance—qualities that have made it a material of choice for ornamental items like vases and gemstones throughout history.
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Key facts
- Mineral.name
- Jasper
- Mineral.boxbgcolor
- 732b1c
- Mineral.boxtextcolor
- FFFFFF
- Mineral.image
- Jasper outcrop in the Bucegi Mountains.jpg
- Mineral.imagesize
- 280px
- Mineral.caption
- Jasper outcrop, Bucegi Mountains, Romania
- Mineral.category
- Aggregate rock (impure chalcedony variety)
- Mineral.formula
- SiO2 (with varying impurities)
- Mineral.system
- Hexagonal
- Mineral.colour
- Most commonly red, but may be yellow, brown, green or (rarely) blue
- Mineral.habit
- Massive
- Mineral.cleavage
- Indiscernible
- Mineral.fracture
- Conchoidal
- Mineral.mohs
- 6.5–7
- Mineral.luster
- Vitreous
- Mineral.diaphaneity
- Opaque
- Mineral.gravity
- 2.5–2.9
- Mineral.refractive
- 1.54–2.65
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