metamorphic
Dark veined metamorphic rock, likely serpentinite
Serpentinite; predominantly serpentine-group minerals, possibly with magnesite or calcite veins
AI-generated identification · may be incorrectDark green-black, fine-grained, dull to waxy luster with contrasting pale veins; serpentine hardness is about 2.5–4 Mohs, with no obvious cleavage and commonly massive texture. The image alone cannot confirm composition.
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Physical properties
Dark green-black, fine-grained, dull to waxy luster with contrasting pale veins; serpentine hardness is about 2.5–4 Mohs, with no obvious cleavage and commonly massive texture. The image alone cannot confirm composition.
Formation & geological history
Forms when ultramafic mantle rocks, especially peridotite, undergo hydration during hydrothermal alteration; occurrences range from ancient ophiolites to modern subduction zones.
Uses & applications
Used as decorative stone, carvings, countertops, and limited ornamental jewelry; softer varieties are mainly collector specimens rather than construction aggregate.
Geological facts
White veins commonly consist of carbonate minerals or fibrous chrysotile; avoid cutting or grinding unknown serpentinite because some specimens may contain asbestos-forming minerals.
Field identification & locations
Look for a green-black waxy appearance, unusually low hardness, dense massive texture, and pale cross-cutting veins; common in California, Italy, New Zealand, Canada, and ophiolite belts worldwide.
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