mineral

Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs); Color: Reddish-brown, earthy; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown, earthy
Luster: Vitreous to dull

Identified June 25, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Reddish-brown, earthy; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

Formation & geological history

Forms when silica-rich fluids permeate through volcanic ash or sedimentary deposits, often during hydrothermal activity. This specimen shows a weathered, microcrystalline quartz structure common in ancient sedimentary basins.

Uses & applications

Used primarily in lapidary work for jewelry, cabochons, and decorative ornamental items. It is also a popular collector's mineral.

Geological facts

Jasper is an opaque variety of chalcedony. The red and brown colors are typically caused by iron inclusions (hematite or goethite). It has been used since antiquity for cylinder seals and amulets.

Field identification & locations

Identify in the field by its hardness (will scratch glass), opaque nature, and conchoidal fracture pattern. Often found in riverbeds or areas with volcanic history. This piece shows significant rounding and surface weathering from erosional transport.