gemstone

Tourmalinated Quartz

Silicon Dioxide (SiO2) with Schorl inclusions (NaFe3Al6(BO3)3Si6O18(OH)4)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale (quartz host) and 7–7.5 (tourmaline needles); Color: Colorless to transparent host quartz with black, dark green, or dark brown needle-like crystals; Luster: Vitreous; Crystal system: Trigonal; Specific gravity: ~2.65–2.80

Hardness: 7 on Mohs scale (quartz host) and 7–7
Luster: Vitreous

Identified October 3, 2026More gemstone →

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Physical properties

Formation & geological history

Formed in hydrothermal veins and granitic pegmatites where needle-like crystals of black tourmaline (schorl) crystallize first or simultaneously and become trapped inside rapidly growing clear quartz crystals.

Uses & applications

Popular as ornamental carvings (eggs, spheres), cabochons for jewelry, decorative display pieces, and sought-after by mineral collectors.

Geological facts

Black tourmaline inclusions inside clear quartz are among the most classic inclusion gems. In metaphysical traditions, it is believed to combine the amplifying properties of clear quartz with the protective shielding of black tourmaline.

Field identification & locations

Identified by dark prismatic needles, striations, and triangular cross-sections embedded within a clear, glass-like quartz matrix. Major commercial sources include Minas Gerais (Brazil), Madagascar, Namibia, and the United States.