mineral
Tourmalinated Quartz
Silicon dioxide with sodium aluminum borosilicate (SiO2 + Na(Al,Fe,Li)3Al6(BO3)3Si6O18(OH)4)
AI-generated identification · may be incorrectHardness is 7 on the Mohs scale. Features distinct green or black tourmaline crystals embedded within a translucent to white quartz matrix with a vitreous luster.
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Physical properties
Hardness is 7 on the Mohs scale. Features distinct green or black tourmaline crystals embedded within a translucent to white quartz matrix with a vitreous luster.
Formation & geological history
Formed in pegmatites and hydrothermal veins through the crystallization of magma-derived fluids rich in silica, boron, and various metals.
Uses & applications
Popularly used in jewelry making, ornamental carvings, and as a collectible mineral specimen.
Geological facts
The contrasting needle-like inclusions are often referred to as 'icicles' by gem cutters. It bridges the energetic properties of both quartz and tourmaline.
Field identification & locations
Easily identified by opaque green or black prismatic needles contrasting against a hard, glassy white quartz background. Found globally including Brazil, Madagascar, and the USA.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
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
Granite
Granite (Phaneritic intrusive igneous rock)
igneous