metamorphic
Serpentinite (likely serpentinized ultramafic rock)
Serpentine-group minerals, chiefly antigorite/lizardite; commonly derived from peridotite
AI-generated identification · may be incorrectPale green-gray, mottled and somewhat waxy or greasy luster, with dark veining and irregular massive texture. Mohs hardness ~2.5–4; no obvious crystal cleavage; specific gravity commonly 2.5–2.7.
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Physical properties
Pale green-gray, mottled and somewhat waxy or greasy luster, with dark veining and irregular massive texture. Mohs hardness ~2.5–4; no obvious crystal cleavage; specific gravity commonly 2.5–2.7.
Formation & geological history
Forms when mantle peridotite reacts with water during hydrothermal alteration, often along faults and tectonic plate boundaries. Typically Paleozoic–Mesozoic or younger depending on the ophiolite body; exact age cannot be determined visually.
Uses & applications
Used as decorative stone, carving material, and occasionally aggregate, though asbestos-bearing varieties require caution. Common specimens generally have modest collector value.
Geological facts
The green color comes from serpentine minerals and associated magnetite, chlorite, or carbonate. Some serpentinite contains chrysotile asbestos, so avoid sawing, grinding, or making dust until tested.
Field identification & locations
The image strongly suggests a weathered green metamorphic rock, but identification is not definitive from a single photograph. Serpentinite is geologically plausible near 38.3°N, 48.8°E, where regional ophiolitic and metamorphic rocks occur; field confirmation requires a hardness test and ideally mineralogical testing.
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