Black Tourmalinated Quartz
Quartz var. Tourmalinated Quartz (Alpha-Quartz with Schorl inclusions) · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal system, typically forming prismatic crystals with striated faces
Mineral Group
Silicate mineral group, specifically Tectosilicates
Chemical Formula
SiO2 with NaFe3Al6(Si6O18)(BO33)(OH)4
Formation Process
Hydrothermal and pegmatitic processes where black tourmaline needles are trapped inside growing quartz crystals under high pressure and temperature
About This Crystal
Beaded bracelet featuring highly polished spherical beads alternating between opaque solid black tourmaline-rich beads and clear quartz beads densely packed with acicular black tourmaline inclusions
Physical Characteristics
Vitreous luster, white streak, conchoidal fracture, lack of cleavage in quartz, specific gravity around 2.65, brittle tenacity
Optical Properties
Singly refractive for tourmaline components and doubly refractive uniaxial positive for quartz, transparent to opaque with prominent inclusions
Hardness & Durability
Origin Region
Brazil, Madagascar, USA, and the Alpine regions; forms in pegmatites and hydrothermal veins
Hardness & Durability
Mohs hardness of 7 for quartz, making it durable for daily jewelry wear with good scratch resistance
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals, ultrasonic cleaners, and prolonged direct sunlight
Rarity & Value
Common to uncommon, with value depending on clarity of quartz, density and pattern of tourmaline needles, and quality of polish
Special Characteristics
Distinct needle-like (acicular) black schorl tourmaline inclusions creating striking contrasting visual patterns within transparent quartz
Lore & History
Believed to combine the grounding and protective energies of black tourmaline with the amplifying properties of clear quartz, often used for balancing spiritual and physical energy