Tourmalinated Quartz

Physical Properties

Hardness: 7 (Mohs scale); Color: Clear to milky white with black needle-like inclusions; Luster: Vitreous; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Formed in hydrothermal veins and pegmatites when quartz and liquid tourmaline crystallize simultaneously or when tourmaline needles are enveloped by growing quartz crystals.

Uses & Applications

Used primarily in lapidary arts, jewelry (cabochons and beads), and as a decorative display specimen for metaphysical enthusiasts.

Geological Facts

The black needles are specifically the mineral Schorl, which is the most common form of tourmaline. While quartz is a silicate, tourmaline is a complex boro-silicate.

Field Identification & Locations

Identify by looking for distinct, needle-like black crystals trapped inside transparent or translucent quartz. Common sources include Brazil, Madagascar, and the United States.

Identified on: 5/1/2026

Mode: Standard