mineral

Black Jasper (Etched)

Silicon Dioxide (SiO2) with impurities

Hardness: 6.5-7 on Mohs scale; Color: Deep black with tan/buff etching; Luster: Vitreous to waxy when polished; Crystal Structure: Trigonal (Cryptocrystalline); Cleavage: None (Conchoidal fracture)

Hardness: 6
Color: Deep black with tan/buff etching
Luster: Vitreous to waxy when polished

Identified June 8, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Deep black with tan/buff etching; Luster: Vitreous to waxy when polished; Crystal Structure: Trigonal (Cryptocrystalline); Cleavage: None (Conchoidal fracture)

Formation & geological history

Formed from silica-rich fluids depositing in cracks or cavities in volcanic rocks or through the replacement of organic materials. Found in many geological ages from Precambrian to recent.

Uses & applications

Predominantly used for ornamental purposes, jewelry making, beads, and as cabochons for carved decorative objects.

Geological facts

Jasper is an opaque variety of chalcedony. Black jasper was historically used as a 'touchstone' to test the purity of gold and silver because of its hardness and dark surface.

Field identification & locations

Identify by its hardness (will scratch glass), opaque nature, and smooth conchoidal fracture. Often found in stream beds or coastal gravels globally, with significant deposits in India, Egypt, and the USA.

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