mineral

Black tourmaline (schorl) in light-colored pegmatite

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄, associated with quartz and feldspar

AI-generated identification · may be incorrect

Schorl is typically black with a vitreous to submetallic luster, Mohs hardness 7–7.5, and elongated, striated crystals with indistinct cleavage. The pale matrix appears quartz- or feldspar-rich; image detail is insufficient for certainty.

Identified October 14, 2026More mineral →

Explore Black tourmaline (schorl) in light-colored pegmatite in the encyclopedia →

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Physical properties

Formation & geological history

Tourmaline commonly crystallizes in boron-rich granitic pegmatites as magma cools and volatile-rich fluids concentrate. Such pegmatites occur across a wide range of geological ages.

Uses & applications

Tourmaline is collected as a mineral specimen and, when transparent and well-formed, cut as a gemstone; pegmatite minerals are also sources of industrial feldspar and quartz.

Geological facts

Black tourmaline is the iron-rich tourmaline variety schorl. Its lengthwise striations and robust prismatic crystals are useful identification clues.

Field identification & locations

Look for black, elongated, ridged crystals embedded in coarse pale quartz and feldspar; notable sources include Brazil, Afghanistan, and parts of the United States. Confirming the matrix and mineral identity may require closer examination.