sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
Hardness: 6.5-7 on Mohs scale; Color: Earthy tones including brown, tan, and black; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; Specific Gravity: 2.58 - 2.91.
- Hardness
- 6
- Color
- Earthy tones including brown, tan, and black
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Earthy tones including brown, tan, and black; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; Specific Gravity: 2.58 - 2.91.
Formation & geological history
Formed from silica-rich petrified mud or volcanic ash flows. The patterns are created by mineral-laden water flow through the parent rock before it fully solidified. Many specimens date back to the Tertiary period.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, ornamental carvings, and decorative home decor objects. Highly valued by collectors for its landscape-like patterns.
Geological facts
The unique 'pictures' or landscapes seen in the rock are caused by dendritic patterns of iron oxide and other mineral impurities. It is often referred to as the 'Global Awareness' stone in metaphysical circles.
Field identification & locations
Identify by its opaque, silicate nature and distinct brownish-tan banding that resembles a desert landscape. Commonly found in regions with high volcanic activity like Oregon and Idaho in the USA.
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