#silicate mineral

• Adularia — A structural variety of orthoclase (potassium feldspar) presenting as transparent to translucent, colorless or whitish crystals, characterized by a specific silvery or opalescent schiller known as adularism. Named after the Adula Alps in Switzerland, where it was historically found within hydrothermal veins of metamorphic rocks. Due to its unique optical properties, fine specimens are cut as moonstones for gemology, while bulk materials are applied in high-grade ceramics and glass manufacturing.
• Allophane — An amorphous or poorly crystalline hydrated aluminum silicate mineral, often associated with the weathering of volcanic rocks and ash deposits in humid environments. This structural compound exhibits a variable chemical composition and a gelatinous or vitreous texture, holding significant importance in soil science due to its high cation exchange capacity and phosphate-fixing ability in andosols.
• Alloshite — A rare mineral or complex silicate discovered within certain metamorphic rocks or hydrothermal deposits, structurally characterized by an atypical crystalline lattice and associations with micro-mineral aggregates of foreign (allogenous) origin. This geological compound is analyzed via X-ray diffraction to establish the specific pressure and temperature conditions in the earth's crust at the moment of its crystallization.
• Aluminosilicate — A complex mineral within the silicate class (representing a large portion of the Earth's crust, such as feldspars, zeolites, and micas) in whose crystalline frameworks part of the silicon atoms are replaced by aluminum atoms bound to oxygen.
• Alumosilicate — A terminological or spelling variant (influenced by German and Russian nomenclatures) for 'aluminosilicat' (aluminosilicate); a complex mineral within the silicate class in whose crystalline frameworks part of the silicon atoms are replaced by aluminum atoms.
• Andesine — A mineral belonging to the silicate class, specifically an intermediate variety of plagioclase feldspar, structurally defined by a specific chemical ratio between albite and anorthite (between 30% and 50% anorthite). It is a common constituent of intermediate igneous rocks, such as andesites and diorites, receiving its name from the Andes Mountains, where it was initially identified and abundantly described.
• Andesine — A mineral belonging to the plagioclase feldspar group, consisting of an isomorphic mixture of albite and anorthite in determined proportions, being a natural silicate of aluminum, calcium, and sodium. It crystallizes in the triclinic system and represents an essential and diagnostic component in the structure of intermediate igneous rocks, its name being linked to its abundant occurrence in the Andes mountain range.
• Amphibole — A generic name given to an important group of silicate minerals (inosilicates) rich in iron, magnesium, calcium, and aluminum, crystallizing in monoclinic or orthorhombic systems. These mineral structures are essential components of many igneous and metamorphic rock brands, presenting a characteristic shape of elongated prisms or thin fibers.
• Anthophyllite — A natural magnesium and iron silicate, crystallizing in the orthorhombic system, belonging to the magnesium amphibole group; a mineral with a lamellar, fibrous, or prismatic structure, colored gray, brown, or greenish, found chiefly in metamorphic rocks (crystalline schists). Its fibrous varieties are industrially utilized as asbestos resistant to acids and high temperatures, though their handling involves severe respiratory toxicity risks.
• Armstrongite — A rare silicate mineral (hydrated calcium zirconium silicate, formula CaZrSi6O15·3H2O) characterized by monoclinic translucent crystals, light to reddish brown color, and vitreous luster. Discovered in the Khan Bogd massif in the Gobi Desert (Mongolia).