mineral
Black tourmaline (schorl) pendant
Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
AI-generated identification · may be incorrectLikely a rough, dark tourmaline crystal set on a chain; tourmaline has Mohs hardness 7–7.5, vitreous luster, and trigonal crystals with prominent lengthwise striations. The image is too small to confirm the mineral identification.
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Physical properties
Likely a rough, dark tourmaline crystal set on a chain; tourmaline has Mohs hardness 7–7.5, vitreous luster, and trigonal crystals with prominent lengthwise striations. The image is too small to confirm the mineral identification.
Formation & geological history
Tourmaline crystallizes in boron-rich granitic pegmatites and metamorphic rocks, commonly during late stages of magma cooling; deposits range from Precambrian to geologically recent.
Uses & applications
Used as a jewelry stone and mineral specimen; tourmaline is also valued for its electrical and piezoelectric properties.
Geological facts
Schorl is the most common tourmaline species and is typically opaque and black.
Field identification & locations
Longitudinal grooves on prismatic crystals and hardness near 7 distinguish tourmaline; it occurs worldwide, notably in Brazil, Afghanistan, and the United States. Confirm identity with close inspection or mineral testing.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral