sedimentary
Picture Jasper
Jasper (Silicon Dioxide, SiO2 with impurities)
Hardness: 6.5-7 (Mohs); Color: Tan, brown, ochre with darker banding; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Tan, brown, ochre with darker banding
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, brown, ochre with darker banding; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine-grained silicate and iron oxides in sedimentary environments. The distinct banding is caused by the rhythmic precipitation of minerals in ground water or volcanic ash layers over millions of years.
Uses & applications
Popular for lapidary work, jewelry making (cabochons), interior decoration, and as a collector's stone due to its scenic, landscape-like patterns.
Geological facts
This variety is often referred to as 'landscape jasper' because the intricate banding can resemble hills, trees, or desert scenes. It is essentially a fossilized mud found in ancient volcanic flows.
Field identification & locations
Identify by its opaque nature, high hardness, and earthy, landscape-like banding. It is commonly found in desert regions of the Western United States, particularly Oregon and Idaho.
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