sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz
Hardness: 6.5-7 on Mohs scale; Color: Tan, brown, ochre, and black; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (cryptocrystalline); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Tan, brown, ochre, and black
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Tan, brown, ochre, and black; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (cryptocrystalline); Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the petrification/silicification of volcanic ash or mud within sedimentary environments. The unique 'scenic' patterns are caused by iron oxides (limonite/hematite) and other mineral impurities that settle during the stone's formation over millions of years.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons), interior decoration, and as metaphysical 'energy' stones.
Geological facts
Picture Jasper is often referred to as 'Earth's Mother' because it appears to contain landscape paintings of mountains and deserts. The most famous variety, Biggs Jasper, was discovered during road construction in Oregon in 1960.
Field identification & locations
Look for opaque, silicate stones with brown/tan 'banding' or 'scenic' patterns that do not transmit light. Found globally with major deposits in the Pacific Northwest of the USA (Oregon and Idaho).
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Cone-in-cone structure (Secondary Sedimentary Structure)
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Clastic Sedimentary Rock Grain (SiO2 dominated)
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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Shale or Slaty Mudstone
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Sandstone
Arenite (primarily SiO2)
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