Garnet (likely Almandine or Spessartine)
Garnet Group, Almandine Fe3Al2(SiO4)3 or Spessartine Mn3Al2(SiO4)3 · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Isometric (Cubic); commonly dodecahedral or trapezohedral crystals, or massive/granular habit
Mineral Group
Silicates (Nesosilicates)
Chemical Formula
(Fe,Mn,Mg,Ca)3(Al,Fe,Cr)2(SiO4)3
Formation Process
Metamorphic (regional or contact metamorphism of clay-rich rocks) or Igneous (pegmatites). Formed under high pressure and temperature.
About This Crystal
The specimen appears as a reddish-brown to earthy orange-brown granular mass or weathered crystal fragment. It is translucent to opaque with a vitreous to resinous luster on fresh surfaces, appearing more dull or earthy where weathered. The surface shows a slightly grainy, pitted texture.
Physical Characteristics
Color: Deep red, brownish-red, or orange-brown. Streak: White. Cleavage: None (distinctive). Fracture: Conchoidal to uneven. Specific Gravity: 3.5 - 4.3. Fluorescence: Generally inert.
Optical Properties
Refractive Index: 1.72 - 1.83 (Singly refractive). Birefringence: None. Pleochroism: None. Dispersion: 0.024-0.027. Usually displays high luster and distinct color blocking.
Hardness & Durability
Origin Region
Global distribution; notable sources include India, Madagascar, Brazil, USA (New York, Idaho), and Sri Lanka. Found in metamorphic rocks and alluvial deposits.
Hardness & Durability
Mohs Hardness: 6.5 - 7.5. Toughness: Fair to Good. It is a durable stone suitable for most jewelry but can be brittle.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners if the stone has internal fractures. Avoid sudden temperature changes and harsh chemicals.
Rarity & Value
Common to Uncommon depending on transparency and size. Value is determined by color intensity, clarity, and carat weight. Red garnets are widely available and affordable.
Special Characteristics
Sometimes exhibits 'asterism' (star effect) or color-change properties, though this specific specimen appears to be a basic mineral variety or rough fragment.
Lore & History
Historically used as talismans for protection and as a 'Stone of Health.' In ancient Rome and Egypt, it was frequently carved into signet rings and used in granulations. It is associated with the Root Chakra and vitality.