gemstone
Blue Tiger's Eye
Hawk's Eye (Quartz pseudomorph over Crocidolite)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Dark blue, gray-blue, black, sometimes with brownish banding. Luster: Silky. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None. Specific gravity: 2.58-2.64.
- Hardness
- 6
- Color
- Dark blue, gray-blue, black, sometimes with brownish banding
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Dark blue, gray-blue, black, sometimes with brownish banding. Luster: Silky. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None. Specific gravity: 2.58-2.64.
Formation & geological history
Formed when quartz replaces crocidolite (blue asbestos) fibers. The incomplete oxidation of the iron leaves it blue rather than the golden brown of standard Tiger's Eye.
Uses & applications
Primarily used in jewelry (cabochons, beads) and as a collector's stone.
Geological facts
Also known as Hawk's Eye or Falcon's Eye. It is the precursor to the golden brown Tiger's Eye.
Field identification & locations
Identify by its silky chatoyancy (cat's eye effect) in shades of blue and gray. Commonly found in South Africa, Australia, and parts of the USA.
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