mineral

Tumbled green stone, likely serpentine

Serpentine-group minerals, commonly antigorite or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Small, rounded, polished green pebble with a waxy-to-dull luster; typically Mohs hardness 2.5–4, imperfect cleavage, and specific gravity about 2.5–2.6. The image is insufficient to confirm the species; jade, aventurine, or green jasper are alternatives.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Serpentine forms when ultramafic rocks undergo hydration and alteration, commonly in oceanic crust and subduction-zone settings; its age varies from Precambrian to modern. This specimen appears human-tumbled and polished.

Uses & applications

Used as carving stone, decorative aggregate, ornaments, and inexpensive jewelry; some varieties are collected as ornamental “new jade.” Avoid treating fibrous chrysotile-bearing material as abrasive or inhaling dust.

Geological facts

Serpentine is a mineral group rather than one single mineral, and its green color comes largely from iron and nickel substitutions. It is California’s state rock.

Field identification & locations

Common sources include California, Vermont, Italy, New Zealand, Canada, and Russia. Field clues are very low hardness, greasy or waxy feel, green streak or pale powder, and possible black veining; definitive identification requires testing or laboratory analysis.