mineral
Picture Jasper
SiO2, Microcrystalline Quartz
Hardness of 6.5 to 7 on the Mohs scale, opaque, mostly reddish brown with lighter and darker bands, vitreous to dull luster, cryptocrystalline structure
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque, mostly reddish brown with lighter and darker bands, vitreous to dull luster, cryptocrystalline structure
Formation & geological history
Formed from silica-rich fluids that percolate through cracks in volcanic ash or other rock, often containing impurities like iron oxides which give it its colors
Uses & applications
Commonly used in lapidary arts for cabochons, carved ornaments, and jewelry making due to its patterns.
Geological facts
Jasper is an aggregate of microquartz and/or chalcedony. 'Picture jaspers' exhibit patterns that resemble landscapes or scenes.
Field identification & locations
Identify by its opacity, hardness (can scratch glass), and distinctive banding or landscape-like patterns. Common in regions with high volcanic activity and silica deposits.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous