Tourmalinated Quartz
Quartz var. Tourmalinated Quartz · Mineral Specimen and Semi-Precious Gemstone
Crystal System
Trigonal, massive to prismatic crystal habit with needle-like inclusions
Mineral Group
Silicates, Tectosilicate subgroup
Chemical Formula
SiO2 with inclusions of Na(Fe3+,Al,Li)3Al6(BO3)3Si6O18(OH)4
Formation Process
Hydrothermal and pegmatitic formation where growing quartz crystals trap pre-existing or co-growing tourmaline needles
About This Crystal
A translucent to transparent milky white quartz matrix distinctly featuring embedded black prismatic needle-like inclusions of schorl tourmaline
Physical Characteristics
Color is white with black inclusions, white streak, conchoidal fracture, vitreous luster on the quartz and resinous on tourmaline, specific gravity approximately 2.65
Optical Properties
Singly and doubly refractive uniaxial positive with a refractive index of 1.544 to 1.553, no significant pleochroism in the host quartz
Hardness & Durability
Origin Region
Found globally with notable deposits in Brazil, Madagascar, the United States, and the Alps
Hardness & Durability
Mohs hardness of 7 for the quartz host and 7 to 7.5 for tourmaline, fair to good toughness, suitable for wire wrapping and various jewelry pieces
Care & Maintenance
Clean with warm soapy water and a soft brush, avoid harsh chemicals, steam, and prolonged direct sunlight
Rarity & Value
Common to uncommon depending on the density and artistic arrangement of the inclusions, moderately priced
Special Characteristics
Distinct needle-like black tourmaline inclusions trapped inside clear or milky quartz crystals
Lore & History
Believed in metaphysical practices to integrate spiritual energy and provide grounding balance, though these are traditional beliefs rather than scientific claims