mineral
Tourmaline (Multi-colored)
Complex Borosilicate (Na,Ca)(Li,Mg,Al,Fe)3Al6(BO3)3Si6O18(OH)4
AI-generated identification · may be incorrectHardness: 7-7.5 (Mohs scale); Color: Pink, green, black, and blue (often in the same strand); Luster: Vitreous to sub-vitreous; Crystal structure: Trigonal; Cleavage: Indistinct; Specific gravity: 3.0-3.3
- Hardness
- 7-7
- Color
- Pink, green, black, and blue (often in the same strand)
- Luster
- Vitreous to sub-vitreous
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Physical properties
Hardness: 7-7.5 (Mohs scale); Color: Pink, green, black, and blue (often in the same strand); Luster: Vitreous to sub-vitreous; Crystal structure: Trigonal; Cleavage: Indistinct; Specific gravity: 3.0-3.3
Formation & geological history
Formed in igneous pegmatites or metamorphic rocks like schist and marble. Their formation involves late-stage hydrothermal activity rich in boron and alkali elements.
Uses & applications
Predominantly used as a gemstone in necklaces and bracelets, and in minor industrial applications for its piezoelectric and pyroelectric properties.
Geological facts
Known as the 'Rainbow Gemstone' because it can be found in almost any color. Ancient legend says it traveled along a rainbow and gathered all the colors.
Field identification & locations
Identify by its hardness and unique pleochroism. Found globally in Brazil, Madagascar, Africa, and Afghanistan. Collectors should look for bead transparency and vibrant color saturation.
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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
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary