Almandine Garnet

Physical Properties

Hardness: 6.5-7.5 (Mohs), Color: Deep red to reddish-brown, Luster: Vitreous to sub-vitreous, Crystal Structure: Isometric/Dodecahedral, Specific Gravity: 4.1-4.3

Formation & Geological History

Formed in high-grade regional metamorphic rocks such as mica schists, gneisses, and amphibolites. Most common in crustal rocks subjected to significant heat and pressure.

Uses & Applications

Commonly used as an abrasive in industrial sandblasting and waterjet cutting; higher quality stones are used as gemstones in jewelry.

Geological Facts

Garnets are one of the most chemically complex mineral groups. They have been used as gemstones since the Bronze Age and were popular in Ancient Roman signet rings.

Field Identification & Locations

Identify by its characteristic dodecahedral shape and hardness; it will easily scratch glass. Commonly found in metamorphic terrains like the Adirondacks (USA), India, and Brazil.

Identified on: 5/2/2026

Mode: Standard