Skolecite is a mineral composed of calcium, sodium, aluminum, carbon, oxygen, and fluorine. It belongs to the zeolite group of minerals, which are characterized by their porous and open framework structures. The chemical formula of skolecite is CaAl2Si3O10·3H2O.
Skolecite typically forms as radiating fibrous or acicular crystals in cavities and fractures in volcanic rocks, particularly basalt. It exhibits a pearly to vitreous luster and can occur in various colors, including white, colorless, yellowish, or pale gray. Its crystal system is monoclinic, and it has a hardness of 5.5 on the Mohs scale.
This mineral is esteemed for its unique crystal habits, which often appear as long, delicate, and needle-like aggregates resembling delicate feathers or hair. These formations give skolecite a distinctive appearance, making it a sought-after collector's mineral.
In terms of its physical and chemical properties, skolecite exhibits a high water content and is relatively lightweight. It is also optically biaxial, meaning it can refract light differently depending on the direction it travels through the crystal. Additionally, it possesses a relatively low specific gravity, making it less dense compared to many other minerals.
Skolecite can be found in various localities throughout the world, including Iceland, the Faroe Islands, India, and the United States. It is often associated with other zeolite minerals, such as scolecite, natrolite, and mesolite. Due to its pleasing appearance and rarity, skolecite is highly valued among mineral enthusiasts and collectors.
