Black Tourmaline in Quartz

Physical Properties

Hardness: 7 (Quartz) to 7.5 (Tourmaline); Color: White/creamy matrix with black prismatic inclusions; Luster: Vitreous; Crystal Structure: Trigonal (Tourmaline) and Hexagonal (Quartz); Cleavage: None/Indistinct; Specific Gravity: 2.65 - 3.1.

Formation & Geological History

Formed in granitic pegmatites through hydrothermal processes. As the molten rock cools, high-pressure fluids allow for the growth of these distinct, needle-like black tourmaline crystals within the quartz matrix.

Uses & Applications

Primarily used as a pocket stone for metaphysical properties (protection/grounding), as an ornamental decorative stone, or as a collector mineral specimen.

Geological Facts

Black tourmaline is known as Schorl and is naturally pyroelectric, meaning it can generate an electric charge when heated or squeezed (piezoelectric). It was once used by the Dutch to pull ash out of clay pipes.

Field Identification & Locations

Identify in the field by the distinct elongated, columnar black crystals with vertical striations embedded in a white or translucent quartz rock. Commonly found in Brazil, Namibia, and the United States (Maine/California).

Identified on: 4/23/2026

Mode: Standard