metamorphic
Green-and-white terrazzo (likely serpentine/marble aggregate)
Composite decorative stone; probable serpentinite (Mg₃Si₂O₅(OH)₄) with white calcite marble fragments in cementitious matrix
AI-generated identification · may be incorrectDark green, black, and pale pink-white angular chips in a polished, glossy surface. Serpentinite is typically Mohs 3–5 with waxy luster; calcite is Mohs 3 and effervesces in dilute acid. This is a processed composite rather than a single natural rock.
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Physical properties
Dark green, black, and pale pink-white angular chips in a polished, glossy surface. Serpentinite is typically Mohs 3–5 with waxy luster; calcite is Mohs 3 and effervesces in dilute acid. This is a processed composite rather than a single natural rock.
Formation & geological history
Manufactured terrazzo made by embedding crushed geological aggregate in cement or resin, then grinding and polishing; the source serpentinite and marble formed through metamorphism, generally during ancient mountain-building events.
Uses & applications
Used for flooring, countertops, wall cladding, stairs, and decorative architectural panels; occasionally sold as architectural salvage or polished slabs.
Geological facts
The irregular chip distribution and uniform polished surface strongly indicate terrazzo, not a natural breccia. Green serpentinite may contain minor chrysotile asbestos, so avoid cutting or sanding unknown material.
Field identification & locations
Identify by its repeated flat polished surface, cement/resin matrix, and randomly distributed chips. A drop of dilute hydrochloric acid may fizz on exposed calcite, but test inconspicuously and avoid damaging the finish; common in architectural interiors worldwide.
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