sedimentary
Picture Jasper
SiO2 (Microcrystalline Quartz / Chalcedony with iron oxide impurities)
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque transparency, and exhibits intricate dendritic or banded patterns resembling landscapes created by mineral inclusions.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque transparency, and exhibits intricate dendritic or banded patterns resembling landscapes created by mineral inclusions.
Formation & geological history
Formed in arid environments or ancient ash beds where silica-rich groundwater percolated through sediments and filled cavities or fractures, solidifying over millions of years.
Uses & applications
Widely used in lapidary arts, cabochons for jewelry, decorative carvings, and as a popular specimen for mineral collectors.
Geological facts
The distinctive 'scenic' patterns are often caused by trapped iron or manganese oxides that mimic trees, mountains, or horizons when the stone is cut and polished.
Field identification & locations
Can be identified in the field by its opaque, multicolored earthy tones and distinct landscape-like banding patterns. Commonly found in locations such as Oregon, USA, and Madagascar.
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