Asbestos minerals are divided into which two groups?

• A. Serpentine & Amphibole
• B. Silicate & Non-silicate
• C. Natural & Synthetic
• D. Isometric & Orthorhombic

Answer: (A)

Asbestos minerals are grouped by their crystal structure into two families: serpentine and amphibole. The serpentine family, led by chrysotile, forms flexible, curly fibers, while the amphibole family includes fibrous minerals like amosite and crocidolite that produce straight, needle-like fibers. This distinction comes from their different silicate structures—serpentine has a layered sheet silicate arrangement, giving curliness, whereas amphibole has a double-chain silicate structure, resulting in rigidity and straight fibers. The practical significance is that these structural differences influence how the fibers interact with the body and their persistence in lung tissue. Other classifications—such as silicate vs non-silicate, natural vs synthetic, or crystal systems like isometric vs orthorhombic—don’t reflect the way asbestos is traditionally categorized.