mineral

Chrysotile Asbestos

Chrysotile [Mg3Si2O5(OH)4]

Hardness: 2.5-3.0 (Mohs); Color: White, gray, or yellowish-green; Luster: Silky or pearly; Crystal structure: Monoclinic, typically occurring in fibrous bundles; Cleavage: None (fibrous); Specific Gravity: 2.5-2.6.

Hardness: 2
Color: White, gray, or yellowish-green
Luster: Silky or pearly

Identified June 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms through the hydrothermal alteration (serpentinization) of ultramafic rocks or magnesian limestones. Often found in metamorphic environments involving high pressure and fluid interaction.

Uses & applications

Historically used in brake linings, insulation, fireproofing, and construction materials due to heat resistance. Today, its use is strictly regulated or banned in many countries due to respiratory health risks from fiber inhalation.

Geological facts

Chrysotile accounts for approximately 95% of the world's asbestos production. While chemically similar to other serpentine minerals like lizardite, its unique coiled silicate structure causes it to form thin, flexible fibers.

Field identification & locations

Identify in the field by its distinctive silky, longitudinal fiber structure and soft, soapy feel. Commonly found in serpentine belts in places like Quebec (Canada), Russia, and the Appalachian mountains.