metamorphic
Tumbled serpentine (likely)
Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectOlive- to yellow-brown, waxy to greasy luster, opaque, and fine-grained with no visible crystals or cleavage; Mohs hardness about 2.5–4, specific gravity roughly 2.5–2.6. The rounded, glossy surface indicates human tumbling/polishing.
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Physical properties
Olive- to yellow-brown, waxy to greasy luster, opaque, and fine-grained with no visible crystals or cleavage; Mohs hardness about 2.5–4, specific gravity roughly 2.5–2.6. The rounded, glossy surface indicates human tumbling/polishing.
Formation & geological history
Forms when magnesium-rich ultramafic rocks such as peridotite are hydrated during low-temperature metamorphism; commonly Paleozoic to younger in exposed ophiolite and subduction-zone belts. Exact identification is uncertain from an image alone.
Uses & applications
Used as ornamental stone, carvings, cabochons, and inexpensive tumbled specimens; historically used for decorative building stone, though dust from some varieties may contain asbestos-form minerals.
Geological facts
Often called “new jade,” but it is not true jade (jadeite or nephrite). Yellow-brown coloration may reflect iron-rich alteration or surface staining.
Field identification & locations
Look for olive-green/brown color, low hardness, waxy feel, and a light streak; it can be scratched by a steel knife, unlike jade. Common localities include California, New Zealand, Italy, Canada, and Afghanistan.
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