Rock Identifier
Jasper (Silicon dioxide (SiO2) with impurities) — mineral
mineral

Jasper

Silicon dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7. Color: reddish-brown with darker spots. Luster: Vitreous to dull. Crystal structure: Microcrystalline quartz. Cleavage: None. Specific gravity: 2.5-2.9.

Hardness
6
Color
reddish-brown with darker spots
Luster
Vitreous to dull
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Physical properties

Hardness: 6.5-7. Color: reddish-brown with darker spots. Luster: Vitreous to dull. Crystal structure: Microcrystalline quartz. Cleavage: None. Specific gravity: 2.5-2.9.

Formation & geological history

Formed from silica-rich fluids in sedimentary or volcanic environments, often involving the replacement of original materials. Coloration is typically due to iron oxide inclusions.

Uses & applications

Commonly used in jewelry, lapidary arts, and as an ornamental stone.

Geological facts

Jasper has been used since antiquity for carving and as a gemstone. The name means 'spotted or speckled stone'.

Field identification & locations

Identified by its opacity, hardness, and varied patterns. Found worldwide, often as nodules or in veins.

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