mineral
Tumbled Citrine (or Heat-Treated Quartz)
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness 7, pale yellow-brown color, vitreous luster, trigonal crystal system, and conchoidal fracture.
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Physical properties
Mohs hardness 7, pale yellow-brown color, vitreous luster, trigonal crystal system, and conchoidal fracture.
Formation & geological history
Forms in pegmatites or hydrothermal veins, often commercially produced by heat-treating pale amethyst or smoky quartz.
Uses & applications
Commonly used in semi-precious jewelry, ornamental carvings, lapidary tumbling, and crystal collections.
Geological facts
Natural citrine is quite rare; the vast majority of commercial citrine is heat-treated amethyst. It gets its natural yellow color from trace ferric iron impurities.
Field identification & locations
Identified by its yellow transparency, lack of cleavage, and ability to scratch glass. Widely sourced from Brazil, Madagascar, and Russia.
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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