mineral

Okenite (in Zeolite matrix)

Okenite (CaSi2O5 · 2H2O)

Hardness: 4.5 - 5 on Mohs scale; Color: Pure white to pale yellow; Luster: Pearly to fibrous/silky; Crystal structure: Triclinic; Cleavage: Perfect in one direction; Specific gravity: 2.3

Hardness: 4
Color: Pure white to pale yellow
Luster: Pearly to fibrous/silky

Identified March 22, 2026More mineral →

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Physical properties

Hardness: 4.5 - 5 on Mohs scale; Color: Pure white to pale yellow; Luster: Pearly to fibrous/silky; Crystal structure: Triclinic; Cleavage: Perfect in one direction; Specific gravity: 2.3

Formation & geological history

Formed in basaltic vugs and cavities via hydrothermal processes. It is typically associated with other zeolites like apophyllite and gyrolite. Most high-quality specimens date from the Tertiary period.

Uses & applications

Primarily valued as a 'collector's mineral' due to its unique aesthetics. While not used in construction or industry due to fragility, it is highly sought after for mineral display cabinets.

Geological facts

Known as the 'Cotton Ball' mineral because its delicate needle-like (acicular) crystals look like soft fur. In reality, these crystals are very fragile and touching them can break the fibers or trap skin oils that discolor the specimen.

Field identification & locations

Identifiable by its distinct fuzzy or 'puffball' appearance within rock cavities. Found primarily in the basalt quarries of Maharashtra, India (notably near Pune). Field identification relies on the white acicular habit and association with basalt.

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