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Stilbite
Main Deposits
India (Poona region, the most famous specimens), Iceland, Scotland, United States (New Jersey), and Brazil.
Description and Characteristics
Stilbite is a hydrated sodium, calcium, and aluminum silicate belonging to the zeolite group. It forms primarily in the cavities of volcanic rocks (basalts) and in metamorphic rocks through low-temperature hydrothermal processes. It is famous for its unique crystal habit: its crystals usually group in divergent aggregates that resemble "wheatsheaves" or "bowties," with gently curved faces. Its name comes from the Greek stilbe (lustre or shine), due to the marked pearly lustre on its cleavage faces. It often appears associated with other minerals such as apophyllite, chalcedony, and heulandite, creating pieces of great aesthetic value for mineral collecting.
| Chemical Formula | $$(Na,Ca)n(Si_{27}A_{l9})O_{72} 路_{28}H_2O$$ |
|---|---|
| Luster | Vitreous, pearly, silky |
| Streak | White |
| Fracture | Irregular to subconchoidal |
| Cleavage | Perfect |
| Hardness | 3,5 - 4 Mohs |
| Crystal System | Monoclinical |
Did you know...?
Due to its porous structure characteristic of zeolites, stilbite can reversibly absorb and release water, as well as act as a natural molecular filter. In the 19th century, mineralogists often confused it with heulandite until it was observed that stilbite always tends to form those very particular fan-shaped or "wheatsheaf" clusters. The peach-colored variety from India is, today, one of the most appreciated decorative stones in the world of mineral interior design due to its delicacy and satiny glow.
New-Age Properties
Stilbite is a stone of "creativity" and "peace of mind." It possesses a gentle and loving vibration that helps calm an overactive mind, facilitating deep and restful sleep if placed near the bed. Spiritually, it is considered a guide for metaphysical journeys, protecting and maintaining contact with the physical world while exploring higher dimensions. It helps in making difficult decisions by connecting the heart with the intuitive mind. It is excellent for meditation, as it allows one to reach a state of stillness quickly, and it is used to overcome feelings of loss or emotional overwhelm, bringing a sense of support and clarity.