metamorphic

Likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (such as antigorite or chrysotile)

AI-generated identification · may be incorrect

Pale green to gray-green, mottled, with a dull to slightly waxy luster and a massive, uneven fracture. Serpentine minerals are Mohs 2.5–5.5; the photo alone cannot establish hardness, exact mineralogy, or specific gravity.

Identified September 28, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when water alters ultramafic rocks, commonly peridotite, during metamorphism. The specimen’s age cannot be determined from appearance; serpentinite is plausible in the tectonically active Coast Mountains region near the reported location.

Uses & applications

Serpentinite is used as decorative stone and carving material; some varieties are polished for ornaments. Chrysotile-bearing material was historically used for asbestos, but should not be cut, ground, or handled in ways that create dust.

Geological facts

The green color is commonly due to serpentine minerals formed by hydration of magnesium-rich rocks. This identification is tentative: pale quartz-, feldspar-, or calcite-rich rock could look similar.

Field identification & locations

The image shows a rough, pale greenish, mottled specimen, consistent with serpentinite but not diagnostic. Check for a waxy feel and softness; a streak, hardness test, and fresh-surface examination would help distinguish it from quartz-rich rocks.