sedimentary/mineral

Jasper

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown with dark mottling; Luster: Dull or waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: None/Conchoidal fracture.

Hardness: 6
Color: Reddish-brown with dark mottling
Luster: Dull or waxy

Identified June 18, 2026More sedimentary/mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown with dark mottling; Luster: Dull or waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed through the deposition of silica from water or hydrothermal fluids into sediments or volcanic rocks, often during the late stages of volcanic activity.

Uses & applications

Used primarily as a gemstone for jewelry, lapidary arts, decorative ornaments, and as a collector's specimen.

Geological facts

Jasper has been used as a gemstone since antiquity and is mentioned in many historical texts; it is often referred to as a bloodstone when it contains red inclusions of iron oxide.

Field identification & locations

Identify by its hardness (it can scratch glass), opaque nature, and typical smooth, waxy surface when tumbled. Frequently found in riverbeds or volcanic regions.