Garnet
Garnet Group var. Almandine or Pyrope · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Cubic (Isometric); usually occurs as dodecahedral or trapezohedral crystals, but here seen as a tumbled, rounded pebble.
Mineral Group
Silicates (Nesosilicates)
Chemical Formula
Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3
Formation Process
Metamorphic (regional metamorphism) but can also form in igneous rocks like pegmatites. Formed under high pressure and temperature conditions within the Earth's crust.
About This Crystal
This is a tumbled stone specimen showing a deep, saturated brownish-red to burgundy color. It is translucent to nearly opaque with a vitreous (glass-like) luster. The surface is smooth from polishing, showing minor internal fractures and a dark, rich body color typical of the pyrope-almandine series.
Physical Characteristics
Color: Dark red to brownish-black; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 3.5-4.3; Fluorescence: Generally none or inert.
Optical Properties
Refractive Index: 1.72-1.83 (Singly Refractive); Birefringence: None; Pleochroism: None; Luster: Vitreous to resinous.
Hardness & Durability
Origin Region
Global distribution; notable sources include India, Sri Lanka, Madagascar, Brazil, and the USA (Idaho/Arizona). Commonly found in metamorphic rocks like mica schists.
Hardness & Durability
Mohs Hardness: 6.5-7.5; Toughness: Fair to Good; Stability: Highly stable against light and chemicals, though sensitive to extreme thermal shock.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic and steam cleaners if internal fractures are present. Store separately from softer stones like calcite to prevent scratching.
Rarity & Value
Common to Uncommon (depending on clarity); Value is determined by color intensity, size, and transparency. Tumbled specimens are generally affordable ($2-$10). Treatments are rare for this mineral family.
Special Characteristics
Singly refractive; some specimens may show asterism (star effect) or color-change properties, though not visible in this tumbled specimen.
Lore & History
Known as the 'Stone of Health' or 'Stone of Commitment.' Historically used as a protective talisman by warriors and travelers. It has been used in jewelry since the Bronze Age and was popular in Victorian mourning jewelry. In metaphysical traditions, it is associated with the Root Chakra and is believed to inspire love and devotion.