mineral
Tumbled jasper (likely)
Microcrystalline quartz (SiO₂), commonly colored by iron oxides
AI-generated identification · may be incorrectOpaque, rounded and polished, with mustard-yellow to reddish-brown mottling and a vitreous-to-waxy luster. Quartz hardness is 7 Mohs; crystals are microscopic and the specimen has no visible cleavage. Identification from the image is not definitive.
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Physical properties
Opaque, rounded and polished, with mustard-yellow to reddish-brown mottling and a vitreous-to-waxy luster. Quartz hardness is 7 Mohs; crystals are microscopic and the specimen has no visible cleavage. Identification from the image is not definitive.
Formation & geological history
Jasper forms when silica-rich fluids fill cavities or replace sediment, with iron impurities producing its colors; it can occur in rocks of many geological ages.
Uses & applications
Used for beads, cabochons, ornaments, and inexpensive lapidary specimens.
Geological facts
Jasper is an opaque variety of chalcedony; the name covers many patterned varieties rather than a single distinct mineral species.
Field identification & locations
Its opaque, iron-stained color and smooth tumbler polish are consistent with jasper. Similar-looking iron-rich agate or other quartz may be difficult to distinguish without examination; jasper occurs worldwide.
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Mineral