sedimentary (microcrystalline quartz)

Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5–7 on Mohs scale; Color: Opaque tan, yellow, brown, and reddish-brown tones; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Hardness: 6
Color: Opaque tan, yellow, brown, and reddish-brown tones
Luster: Vitreous to waxy (when polished)

Identified March 11, 2026More sedimentary (microcrystalline quartz) →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary environments. Impurities like iron oxides give it its characteristic opaque, earthy colors. It can be found in formations ranging from the Precambrian to the present day.

Uses & applications

Commonly used in jewelry as cabochons, pendants, and beads. It is also used for decorative carvings, orbital stones, and is highly popular among lapidary hobbyists and crystal collectors.

Geological facts

Jasper has been used by ancient civilizations for seal stones and amulets for thousands of years. It is often referred to as the 'supreme nurturer' in metaphysical circles. This specific specimen appears to be 'Picture Jasper' or a similar earthy variety, known for its landscape-like patterns.

Field identification & locations

Identify in the field by its opacity (it does not transmit light even on thin edges), its hardness (will scratch glass), and its smooth, shell-like fracture pattern. It is commonly found in riverbeds, deserts, and volcanic regions worldwide, notably in the Western USA, Brazil, and India.

Other sedimentary (microcrystalline quartz) specimens

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Dalmatian Stone (commonly called Dalmatian Jasper)

Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)

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Black Jasper (Black Onyx substitute)

Silicon Dioxide (SiO2) with carbonaceous impurities

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Yellow Jasper

Chalcedony (Silicon Dioxide, SiO2)

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Jasper River Pebble

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Red Jasper

Jasper (SiO2) with Hematite (Fe2O3) inclusions

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Red Jasper (River Pebble)

Silicon Dioxide (SiO2) with hematite impurities

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