Red Garnet in Matrix
Garnet Group var. Almandine or Pyrope · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Isometric (Cubic); typically occurs as dodecahedral or trapezohedral crystals or granular masses
Mineral Group
Silicates; Subgroup: Nesosilicates
Chemical Formula
X3Y2(SiO4)3 where X=Fe2+, Mg; Y=Al2. Typical formula: Fe3Al2Si6O12
Formation Process
Metamorphic: Forms under high pressure and temperature conditions during regional metamorphism of clay-rich sedimentary rocks (shales).
About This Crystal
A rough mineral specimen featuring reddish-brown to dark red crystals embedded in a light gray to tan host rock. Crystals appear translucent to opaque with a vitreous to resinous luster. The host matrix has a granular, dull texture.
Physical Characteristics
Color: Deep red to brownish-red; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 3.5-4.3; Tenacity: Brittle; Fluorescence: Generally none.
Optical Properties
Refractive Index: 1.714–1.830; Singly refractive (Isotopic); No pleochroism or birefringence; Dispersion: 0.024-0.027.
Hardness & Durability
Origin Region
Global distribution; notable sources include India, Sri Lanka, Madagascar, and the USA (New York or Idaho). Found typically in metamorphic schists and gneisses.
Hardness & Durability
Mohs Hardness: 6.5 - 7.5. Good toughness due to lack of cleavage, though brittle. Highly stable under normal conditions.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners if inclusions are present. Store away from harder stones like sapphire to prevent scratching.
Rarity & Value
Common to Uncommon for rock-grade specimens; gem-quality is more valuable. Generally affordable as a mineral specimen; value increases with crystal size, clarity, and color saturation.
Special Characteristics
No visible optical phenomena (like asterism) in this specimen; presence of distinctive dodecahedral growth patterns when fully formed.
Lore & History
Garnets have been used since the Bronze Age; ancient Egyptians considered them symbols of life. Historically, they were thought to protect travelers and offer strength. Modern lore associates garnet with the root chakra, passion, and grounding energy.