mineral
Black tourmaline (schorl) pendant
Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
AI-generated identification · may be incorrectThe pictured polished, pointed pendant appears opaque black with a vitreous to resinous luster. Tourmaline has Mohs hardness 7–7.5 and a trigonal crystal structure; the photo does not reveal diagnostic natural crystal faces or cleavage.
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Physical properties
The pictured polished, pointed pendant appears opaque black with a vitreous to resinous luster. Tourmaline has Mohs hardness 7–7.5 and a trigonal crystal structure; the photo does not reveal diagnostic natural crystal faces or cleavage.
Formation & geological history
Schorl crystallizes in boron-rich granitic pegmatites and metamorphic rocks as magma cools or fluids alter surrounding rock. Its geological age varies by deposit; the pendant’s source cannot be determined from the image.
Uses & applications
Used as a decorative gemstone in jewelry and as a collectible mineral; this shaped piece is likely intended as a pendant.
Geological facts
Black tourmaline is the iron-rich end member of the tourmaline group. Its natural crystals are commonly elongated and longitudinally striated, unlike this cut shape.
Field identification & locations
The image is consistent with polished schorl, but identification from appearance alone is uncertain; check for natural striations, hardness, and mineral tests. It occurs worldwide, notably in Brazil, Africa, and the United States.
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Granite, a coarse-grained felsic intrusive igneous rock
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Unidentified pink-and-gray mineral or rock specimen
Undetermined; the image is too blurry for reliable identification
mineral