Red Tiger's Eye
Pseudomorph of Quartz after Crocidolite (variety: Red) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Hexagonal systems; fibrous habit (pseudomorphous after monoclinic crocidolite)
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 with inclusions of oxidized Amphibole (Iron Oxide)
Formation Process
Hydrothermal metamorphic process where silica replaces asbestos fibers (crocidolite). The red color is typically produced by gentle heating of gold tiger's eye, which oxidizes the iron content.
About This Crystal
A polished, tumbled stone with a deep mahogany to cherry red color. It exhibits silky luster and distinct chatoyant bands that shimmer when moved under light. It has an opaque transparency with undulating fibrous textures.
Physical Characteristics
Color: Reddish-brown to deep ruby; Streak: White; Cleavage: None; Fracture: Splintery to uneven; Specific Gravity: 2.64-2.71; Fluorescence: Typically inert.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; Optical Phenomenon: Chatoyancy (cat's eye effect) caused by the parallel arrangement of quartz-encapsulated fibers.
Hardness & Durability
Origin Region
South Africa (Griquadown West), Western Australia, Namibia, and India; typically found in banded iron formations.
Hardness & Durability
Mohs Hardness: 6.5 to 7.0; Toughness: Good; Stability: Very stable; excellent for all types of jewelry including rings.
Care & Maintenance
Safe to clean with warm soapy water and a soft brush. Avoid harsh chemicals and ultrasonic cleaners if the stone has surface-reaching fractures. Store separately from softer stones like Opal.
Rarity & Value
Common; Value is determined by the strength of the chatoyancy and the richness of the red color. Often naturally yellow stone that has been heat-treated to reach this hue.
Special Characteristics
Chatoyancy is the primary feature, where a band of light moves across the surface. When heated from Golden Tiger's Eye, the Limonite (iron hydroxide) converts to Hematite (iron oxide), creating the red tone.
Lore & History
Historically associated with the planet Mars and the 'warrior' spirit. In traditional lore, it is believed to enhance motivation, metabolism, and physical energy, often associated with the Root Chakra. Ancient Roman soldiers reportedly wore it for protection in battle.