mineral
Tourmalinated Quartz
Silicon Dioxide (SiO2) with inclusions of Schorl (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale); Color: Clear or milky white backdrop with needle-like black inclusions; Luster: Vitreous (glassy); Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture.
- Hardness
- 7 (Mohs scale)
- Luster
- Vitreous (glassy)
Identified More mineral →
Explore Tourmalinated Quartz in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs scale); Color: Clear or milky white backdrop with needle-like black inclusions; Luster: Vitreous (glassy); Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed in hydrothermal veins and pegmatites where silica-rich fluids cool. During formation, black tourmaline crystals grow first or simultaneously, becoming trapped within the quartz matrix. Most commercial specimens are from the Neoproterozoic era.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and sculpture. It is highly valued as a decorative collector's stone and in metaphysical jewelry.
Geological facts
Also known as Schorlated Quartz; the black needles are specifically the iron-rich variety of tourmaline called Schorl. It is unique because it combines the properties of two distinct minerals in one specimen.
Field identification & locations
Identify in the field by the distinct black, needle-like or rod-like inclusions appearing to pierce through translucent stone. Commonly found in Brazil, Namibia, and the USA. Collectors should look for high clarity in the quartz and well-defined tourmaline patterns.
