Scolecite
Scolecite · Mineral Specimen and Collector Mineral
Crystal System
Monoclinic, typically forming radiating, acicular, or prismatic crystal aggregates resembling fans or sprays
Mineral Group
Silicates (Tectosilicate subgroup, Zeolite group)
Chemical Formula
CaAl2Si3O10 * 3H2O
Formation Process
Hydrothermal or low-temperature metamorphic formation, typically crystallizing from aqueous solutions in vesicles and cavities of basaltic and volcanic rocks.
About This Crystal
The specimen features a fan-like or sheaf-like cluster of elongated, white to colorless prismatic crystals radiating outwards. The crystals are translucent to transparent with a vitreous to pearly luster, displaying fine striations along their length and delicate terminated points at the apex.
Physical Characteristics
Color is white, colorless, or occasionally tinted pinkish-white. Streak is white. Perfect cleavage in two directions forming prismatic angles. Fracture is uneven. Specific gravity is approximately 2.2 to 2.4. Tenacity is brittle.
Optical Properties
Biaxial (-) with refractive indices around n_alpha = 1.512, n_beta = 1.519, n_gamma = 1.520. Displays low birefringence and may exhibit weak fluorescence under UV light.
Hardness & Durability
Origin Region
Notable sources include Nashik and Pune in Maharashtra, India; Berufjordur, Iceland; and various localities in Brazil and the USA. Forms primarily in basalt cavities and amygdules.
Hardness & Durability
Mohs hardness of 5 to 5.5. Low durability due to perfect cleavage and brittle nature, making it unsuitable for everyday jewelry wear and highly sensitive to impact.
Care & Maintenance
Clean gently with warm soapy water using a soft brush. Avoid ultrasonic cleaners, steam, and harsh chemicals. Store carefully wrapped to prevent damage from harder minerals.
Rarity & Value
Uncommon to rare depending on specimen size and perfection of the radiating formation. High-quality fan clusters from India are prized by collectors, with prices ranging from moderate to high based on aesthetics.
Special Characteristics
Displays distinct pyroelectric and piezoelectric properties, and some specimens can show weak triboluminescence or thermal expansion effects when heated.
Lore & History
Popular in modern crystal healing for promoting inner peace, tranquility, and emotional balance. Associated with the third eye and crown chakras. These are traditional beliefs and cultural associations rather than scientific properties.