mineral

Chrysotile Asbestos

Chrysotile (Mg3Si2O5(OH)4)

Hardness: 2.5 on the Mohs scale, Color: White, gray, yellowish-white, or green, Luster: Silky to greasy, Crystal structure: Monoclinic, fibrous habit, Cleavage: None distinct (fibrous separation), Specific gravity: 2.5 - 2.6

Hardness: 2

Identified August 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the serpentinization of ultramafic rocks (such as dunite and peridotite) by hydrothermal solutions at low to moderate temperatures, often during regional metamorphism.

Uses & applications

Historically used in fireproofing, insulation, cement, and friction products (like brake pads). Due to health hazards associated with inhaling asbestos fibers, commercial mining and use are heavily restricted or banned in many countries today. Specimens are collected primarily by mineral enthusiasts.

Geological facts

Chrysotile is the most common type of asbestos, accounting for about 95% of all asbestos used globally. Its flexible, heat-resistant fibers can be spun and woven like fabric.

Field identification & locations

Easily identified by its characteristic fibrous, silky, bundle-like appearance and flexible, separable threads. Found in serpentinite-bearing regions worldwide, including Canada, Russia, and South Africa. Collectors should handle raw specimens with care to avoid generating airborne dust.