Rock Identifier
Jasper (SiO2 (Cryptocrystalline quartz)) — mineral
mineral

Jasper

SiO2 (Cryptocrystalline quartz)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on the Mohs scale. Color: Brown, red, orange, yellow (due to iron inclusions). Luster: Dull to greasy, can be polished. Crystal structure: Trigonal (microcrystalline). Cleavage: None. Specific gravity: 2.5-2.9.

Hardness
6
Color
Brown, red, orange, yellow (due to iron inclusions)
Luster
Dull to greasy, can be polished
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Physical properties

Hardness: 6.5-7 on the Mohs scale. Color: Brown, red, orange, yellow (due to iron inclusions). Luster: Dull to greasy, can be polished. Crystal structure: Trigonal (microcrystalline). Cleavage: None. Specific gravity: 2.5-2.9.

Formation & geological history

Forms as a secondary mineral from silica-rich fluids in sedimentary or volcanic environments, often through the replacement of other minerals or in veins and nodules.

Uses & applications

Used in lapidary work, jewelry, ornamental carvings, and historically for tools and weapons.

Geological facts

Jasper is an opaque variety of chalcedony. The name means 'spotted or speckled stone'.

Field identification & locations

Identify by its opacity, hardness (scratches glass), and waxy/dull luster when unpolished. Commonly found worldwide, often in riverbeds or beaches as water-worn pebbles.

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