mineral

Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown with tan mottling; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown with tan mottling
Luster: Vitreous to dull

Identified June 21, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown with tan mottling; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Formation & geological history

Usually forms when fine particulate materials are cemented by silica-rich fluids in sedimentary environments or through the replacement of organic materials. This specimen appears to be a weathered or rough tumbled piece.

Uses & applications

Commonly used in lapidary art, jewelry (cabochons), interior decoration, and as a popular collector specimen due to its diverse color patterns.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word for 'spotted stone.' It has been used since antiquity for seals, amulets, and ornamental carvings.

Field identification & locations

Identify by its hardness (it can scratch glass), its opaque nature (unlike agate which is translucent), and its smooth, waxy feel when polished. Commonly found in riverbeds or arid regions where volcanic activity has occurred.