mineral
Sapphire
Corundum (Al2O3)
AI-generated identification · may be incorrectHardness: 9 on Mohs scale, Color: typically blue but can be pink, yellow, green, white, or multi-colored, Luster: vitreous to adamantine, Crystal structure: trigonal, Cleavage: none, Specific gravity: 3.95-4.10
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Physical properties
Hardness: 9 on Mohs scale, Color: typically blue but can be pink, yellow, green, white, or multi-colored, Luster: vitreous to adamantine, Crystal structure: trigonal, Cleavage: none, Specific gravity: 3.95-4.10
Formation & geological history
Forms in igneous rocks like syenites and pegmatites, and in metamorphic rocks like marble
Uses & applications
Primarily used as a gemstone in jewelry, also used industrially for abrasives and in high-durability windows and scientific instruments
Geological facts
Sapphire is the birthstone for September and is one of the four precious stones, along with diamond, ruby, and emerald
Field identification & locations
Can be identified by its high hardness (only diamond is harder) and high specific gravity. Found in countries like Sri Lanka, Madagascar, Australia, and the USA (Montana). Collectors look for vibrant, evenly distributed color and good clarity
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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