mineral
Tumbled yellow-brown jasper (likely)
Microcrystalline quartz, SiO₂; jasper is an opaque, iron-bearing variety of chalcedony
AI-generated identification · may be incorrectSmooth, opaque mustard-to-brown stone with a waxy-to-glassy polish and dark mottling; quartz hardness 6.5–7, trigonal crystal structure, specific gravity about 2.6. No visible cleavage; breaks conchoidally when unworked.
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Physical properties
Smooth, opaque mustard-to-brown stone with a waxy-to-glassy polish and dark mottling; quartz hardness 6.5–7, trigonal crystal structure, specific gravity about 2.6. No visible cleavage; breaks conchoidally when unworked.
Formation & geological history
Forms as silica-rich fluids fill cavities or replace rock, with iron oxides creating its color and patterns; jasper deposits occur in rocks of many geological ages. This specimen has been tumbled and polished.
Uses & applications
Used for beads, cabochons, ornaments, and small decorative objects; jasper is also collected as a lapidary material.
Geological facts
Jasper is an opaque form of chalcedony, distinguished from more translucent agate by its opacity and commonly abundant inclusions.
Field identification & locations
Common in silica-rich veins and volcanic or sedimentary settings worldwide. The opaque, mottled appearance and hardness are consistent with jasper, though a photo cannot confirm the exact variety.
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