mineral
Stilbite
Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
AI-generated identification · may be incorrectHardness: 3.5-4 on Mohs scale; Color: White, cream, or peach; Luster: Pearly to vitreous; Crystal Structure: Monoclinic (often forming bow-tie shaped aggregates); Cleavage: Perfect in one direction; Specific Gravity: 2.1-2.2
- Hardness
- 3
- Color
- White, cream, or peach
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 3.5-4 on Mohs scale; Color: White, cream, or peach; Luster: Pearly to vitreous; Crystal Structure: Monoclinic (often forming bow-tie shaped aggregates); Cleavage: Perfect in one direction; Specific Gravity: 2.1-2.2
Formation & geological history
Commonly forms as a secondary mineral in volcanic rocks, specifically within the cavities (vesicles) of basalt or andesite through hydrothermal activity. Frequently associated with other zeolites.
Uses & applications
Primarily used as a collector specimen; also utilized in industrial water softening and as a molecular sieve due to its zeolite properties.
Geological facts
The name comes from the Greek word 'stilbein,' meaning 'to shine,' referring to its pearly luster. It is particularly famous for forming 'bow-tie' or 'hourglass' shaped clusters.
Field identification & locations
Identify in the field by its distinct sheaf-like or bow-tie crystal habits and pearly luster on cleavage surfaces. Commonly found in the Deccan Traps of India, Iceland, and the Faroe Islands.
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