metamorphic
Weathered greenish metamorphic rock, possibly serpentinite
Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)
AI-generated identification · may be incorrectPale green to tan, dull-to-waxy luster, rounded and strongly weathered; typically hardness 2.5–4, specific gravity about 2.5–2.6, with poor or indistinct cleavage. The photograph lacks enough detail for a confident mineral identification.
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Physical properties
Pale green to tan, dull-to-waxy luster, rounded and strongly weathered; typically hardness 2.5–4, specific gravity about 2.5–2.6, with poor or indistinct cleavage. The photograph lacks enough detail for a confident mineral identification.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite hydrate during alteration by circulating fluids, commonly in ophiolites and subduction zones; ages range from Precambrian to modern tectonic settings.
Uses & applications
Used as decorative stone, carving material, aggregate, and historically as a source of asbestos-bearing material; ordinary fragments have little commercial value.
Geological facts
Serpentinite often has a characteristic greasy or waxy feel and may show mottled green veining. Chrysotile-bearing material should not be cut, sanded, or crushed because inhaled fibers are hazardous.
Field identification & locations
Common in California, Italy, New Zealand, Canada, and many ophiolite belts. A field test is a green waxy appearance and relatively low hardness, but confirmation requires streak, hardness, acid, or thin-section testing.
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