mineral
Watermelon Tourmaline
(Na,Ca)(Al,Fe,Li)_3(Al,Si)_6O_18(BO_3)_3(OH)_4
AI-generated identification · may be incorrectMohs hardness 7-7.5, distinct color zoning (pink core with green outer rim), vitreous luster, trigonal crystal system, conchoidal fracture.
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Physical properties
Mohs hardness 7-7.5, distinct color zoning (pink core with green outer rim), vitreous luster, trigonal crystal system, conchoidal fracture.
Formation & geological history
Forms primarily in granite pegmatites and hydrothermal veins through fractional crystallization of magma rich in water and boron.
Uses & applications
Valued as a gemstone in high-end jewelry and sought after by mineral collectors for its unique multicolored zoning.
Geological facts
The color zoning results from changing chemical conditions—specifically manganese and iron concentrations—during crystal growth.
Field identification & locations
Identified by its characteristic concentric color bands of pink and green, commonly sourced from Brazil, Madagascar, and the USA.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
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