metamorphic
Brecciated serpentinite
Serpentinite breccia, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, chrysotile) with pale carbonate or quartz-rich veins
AI-generated identification · may be incorrectAngular pale fragments and dark green-gray matrix with a network of light veins. Serpentine minerals are typically Mohs 2.5–5.5, waxy to dull, and monoclinic or fibrous; exact hardness and composition require testing.
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Physical properties
Angular pale fragments and dark green-gray matrix with a network of light veins. Serpentine minerals are typically Mohs 2.5–5.5, waxy to dull, and monoclinic or fibrous; exact hardness and composition require testing.
Formation & geological history
Forms when ultramafic rock is altered by water into serpentinite, then fractured and recemented by mineral-rich fluids. Serpentinization occurs in oceanic crust and mountain belts across a wide range of geological ages.
Uses & applications
Decorative and ornamental stone; serpentinite is also used as dimension stone and, historically, as a source of asbestos where chrysotile is present.
Geological facts
The pale, angular patches and crosscutting vein network suggest brecciation and later mineral infill; visual identification alone cannot confirm the minerals.
Field identification & locations
Look for a greenish, often waxy matrix, irregular angular fragments, and veins; common in ophiolites and other ultramafic-rock regions. Avoid cutting or grinding unknown serpentinite because some varieties contain asbestos.
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