mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
AI-generated identification · may be incorrectHardness: 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
- Hardness
- 6
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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.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary