metamorphic
Serpentinite (or Green Quartz Pebble)
Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)
Hardness: 3-6 (depending on serpentine/quartz ratio), Color: Pale green to olive green with veinlets of white quartz or calcite, Luster: Waxy to greasy or dull, Texture: Smooth, water-worn pebble
- Luster
- Waxy to greasy or dull, Texture: Smooth, water-worn pebble
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Physical properties
Hardness: 3-6 (depending on serpentine/quartz ratio), Color: Pale green to olive green with veinlets of white quartz or calcite, Luster: Waxy to greasy or dull, Texture: Smooth, water-worn pebble
Formation & geological history
Formed by low-grade metamorphism (serpentine alteration) of ultramafic igneous rocks rich in olivine and pyroxene, frequently found along subduction zones and stream beds.
Uses & applications
Used as ornamental stone, carving material, aggregate, and for lapidary tumbling.
Geological facts
Serpentinite gets its name from its serpent-like, scaly appearance and mottled green colors. It is the official state rock of California.
Field identification & locations
Identified by its characteristic greenish hue, soapy or waxy feel, and presence of micro-veinlets. Commonly found in riverbeds, coastal beaches, and metamorphic terranes.
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