
Mineral
Red Garnet
Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)
Hardness: 6.5-7.5 on Mohs scale; Color: Red, often with violet or brownish tints; Luster: Vitreous to sub-adamantine; Crystal Structure: Isometric (often dodecahedral or trapezohedral crystals); Cleavage: None (conchoidal fracture); Specific Gravity: 3.5-4.3
- Hardness
- 6
- Color
- Red, often with violet or brownish tints
- Luster
- Vitreous to sub-adamantine
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Physical properties
Hardness: 6.5-7.5 on Mohs scale; Color: Red, often with violet or brownish tints; Luster: Vitreous to sub-adamantine; Crystal Structure: Isometric (often dodecahedral or trapezohedral crystals); Cleavage: None (conchoidal fracture); Specific Gravity: 3.5-4.3
Formation & geological history
Garnets typically form under high pressure and temperature conditions in metamorphic rocks like schist and gneiss, as well as in some igneous rocks like granite and basalt. Their formation often occurs during regional or contact metamorphism. The geological age varies widely depending on the specific rock formation.
Uses & applications
Primarily used as a gemstone in jewelry due to its hardness and varied colors, especially the red varieties like almandine and pyrope. Industrial uses include abrasives (garnet sand for sandblasting, waterjet cutting, and sandpaper) and as a filtration medium.
Geological facts
Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. The name 'garnet' comes from the Latin 'granatus' meaning 'grain' or 'seed', likely referring to the resemblance of its crystals to the seeds of a pomegranate.
Field identification & locations
Red garnets are often found as individual crystals within metamorphic rocks. In the field, one can look for the distinct dodecahedral or trapezohedral crystal shapes and its characteristic reddish hue. They are commonly found in locations worldwide including India, Sri Lanka, Brazil, the Czech Republic, and parts of the USA (e.g., Arizona, Idaho, New York). For collectors, identifying garnets involves examining crystal habit, color, and density. Red garnets are rarely perfectly inclusion-free, so minor imperfections are common and do not necessarily devalue the stone significantly.
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sedimentary
Schist
Schist
Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock