metamorphic

Serpentinite

Serpentinite, composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)

AI-generated identification · may be incorrect

Pale green to cream with dark veins and mottling; typically waxy to dull, Mohs hardness about 2.5–5.5, and variable texture. The pictured specimen’s appearance is consistent with serpentinite, though a photo cannot confirm its identity or mineral composition.

Identified October 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when water alters ultramafic rocks, commonly peridotite, during hydrothermal activity or metamorphism; this process has occurred throughout geological history, especially at seafloor and subduction-zone settings.

Uses & applications

Decorative stone, carvings, and occasionally architectural or ornamental material; softer varieties take a polish but are not commonly used as gemstones.

Geological facts

Serpentinite’s green color comes from serpentine minerals, often accompanied by magnetite and other alteration minerals. Some serpentinite contains asbestos-form serpentine minerals, so avoid grinding or cutting unidentified pieces.

Field identification & locations

Look for mottled green color, dark veining, and a relatively soft, sometimes waxy surface; common in ancient oceanic and mountain-belt rocks. A hardness or acid test is best avoided without proper identification.