mineral

Black Tourmaline in Quartz

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) in Quartz (SiO2)

Hardness: 7 (Quartz) and 7.0-7.5 (Tourmaline). Color: Milky to clear white with opaque black needle-like inclusions. Luster: Vitreous. Crystal Structure: Hexagonal/Trigonal. Cleavage: Indistinct. Specific Gravity: ~2.65-3.1.

Hardness: 7 (Quartz) and 7
Luster: Vitreous

Identified July 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed in granitic pegmatites or hydrothermal veins where boron-rich fluids crystallize into tourmaline alongside silica-rich quartz. These specimens are often hundreds of millions of years old.

Uses & applications

Used primarily for ornamental carvings, gemstone cabochons, and as a popular specimen for mineral collectors. It is also highly valued in metaphysical communities for its perceived grounding properties.

Geological facts

This specific combination is often called Tourmalinated Quartz. The black tourmaline grows as thin, needle-like crystals (rutiles) or blocky prisms within the quartz while the quartz is still in a liquid or semi-solid state.

Field identification & locations

Identified by the distinct contrast between the white/clear host and the sharply defined black crystalline inclusions. Commonly found in Brazil, Madagascar, and Namibia. In the field, look for quartz veins near granitic intrusions.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock

Granite

Granite (Phaneritic intrusive igneous rock)

igneous