Tourmalinated Quartz
Quartz var. Tourmalinated Quartz · Mineral Specimen and Semi-Precious Gemstone
Crystal System
Trigonal system; typically occurs as massive or crystalline quartz embedded with prismatic black tourmaline (schorl) needles.
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2 with inclusions of Na(Fe3+,Al,Li)3Al6(BO3)3Si6O18(OH)4
Formation Process
Hydrothermal and pegmatitic formation where needle-like crystals of tourmaline become enveloped and trapped inside growing quartz crystals.
About This Crystal
The specimen features a white to translucent quartz matrix hosting dark, prismatic inclusions of black tourmaline on its surface and within its structure. The luster is vitreous on the quartz faces and sub-metallic to resinous on the tourmaline inclusions.
Physical Characteristics
Color is white/colorless with black inclusions; white streak; uneven to conchoidal fracture; no distinct cleavage in quartz; specific gravity around 2.65.
Optical Properties
Singly or doubly refractive depending on the inclusion interaction; uniaxial positive; vitreous to greasy luster with no major chatoyancy in this specimen.
Hardness & Durability
Origin Region
Found globally with notable deposits in Brazil, Madagascar, the United States, and the Himalayan region. Typically forms in pegmatites and hydrothermal veins.
Hardness & Durability
Mohs hardness of 7 for the quartz host and 7 to 7.5 for the tourmaline inclusions. Good durability, though fractures can be a vulnerability.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals, ultrasonic cleaners, and prolonged direct sunlight if dyed or treated.
Rarity & Value
Common to uncommon depending on the clarity and aesthetic appeal of the inclusions. Affordable as a mineral specimen and carved gemstone.
Special Characteristics
Features distinct black acicular or prismatic mineral inclusions (schorl tourmaline) encapsulated within a host quartz matrix.
Lore & History
Often regarded in modern metaphysical practices as a powerful grounding stone that combines the energy of quartz with the protective qualities of tourmaline. Historically valued as a unique collector mineral specimen.