mineral

Green Chalcedony (likely Chrysoprase or Green Onyx)

Silicon Dioxide (SiO2) with trace nickel or chromium inclusions

Hardness: 6.5-7 (Mohs scale). Color: Apple-green to deep emerald green. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) cryptocrystalline. Cleavage: None (conchoidal fracture). Specific Gravity: 2.6-2.64.

Hardness: 6
Color: Apple-green to deep emerald green
Luster: Vitreous to waxy

Identified April 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed in the cracks and cavities of basalt and other volcanic rocks, or as secondary deposits in weathered serpentinites and other nickeliferous rocks. It forms via the cooling of silica-rich groundwater.

Uses & applications

Primarily used in jewelry (cabochons, beads, rings), ornamental carvings, and as a semi-precious collector stone.

Geological facts

Chrysoprase is the most valuable variety of chalcedony. In ancient times, the Greeks and Romans used it for seals and cameos. It is often mistaken for jade due to its similar color and translucency.

Field identification & locations

Identify by its waxy luster and solid, even green color (unlike emerald, which often has visible inclusions). Commonly found in Australia, Brazil, Russia, and the USA (California/Arizona). It is more translucent than jasper.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral