mineral
Okenite
Okenite, Ca3Si6O15·6H2O
Hardness: 4.5 to 5 (matrix may vary), Color: White, yellowish, or greenish-white, Luster: Vitreous to pearly or silky, Crystal structure: Triclinic, forming distinct fibrous radiated spheres often called cotton balls.
- Hardness
- 4
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Physical properties
Hardness: 4.5 to 5 (matrix may vary), Color: White, yellowish, or greenish-white, Luster: Vitreous to pearly or silky, Crystal structure: Triclinic, forming distinct fibrous radiated spheres often called cotton balls.
Formation & geological history
Formed as a secondary mineral in basalt cavities and amygdules, typically via hydrothermal activity or low-temperature alteration of basaltic lavas.
Uses & applications
Primarily sought after by mineral collectors for its unique aesthetic and fibrous ball formations.
Geological facts
Okenite is famous for its delicate, needle-like fibrous clusters that look like cotton balls or pins radiating from a center, though touching them can easily crush the delicate fibers.
Field identification & locations
Found worldwide in basaltic regions, most notably in the Deccan Traps of India. Identified by its characteristic radiating fibrous white spheres on a dark basalt matrix.
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