mineral
Blue Sapphire (likely costume glass imitation)
Corundum (Al2O3) with iron/titanium impurities
AI-generated identification · may be incorrectHardness: 9 (Mohs scale), Color: Sky blue to deep navy, Luster: Vitreous/Adamantine, Crystal structure: Trigonal (hexagonal prisms), SG: 3.95-4.03
Identified More mineral →
Explore Blue Sapphire (likely costume glass imitation) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 9 (Mohs scale), Color: Sky blue to deep navy, Luster: Vitreous/Adamantine, Crystal structure: Trigonal (hexagonal prisms), SG: 3.95-4.03
Formation & geological history
Formed in metamorphic rocks like marble or schist, and in igneous rocks like basalt. Crystallization occurs under high pressure/temperature over millions of years.
Uses & applications
High-end jewelry, industrial abrasives, watch crystals, and laser components (synthetic versions).
Geological facts
Sapphires are the second hardest natural mineral after diamond. Most natural blue sapphires are heat-treated to enhance their color and clarity for the market.
Field identification & locations
Field identification involves checking for 6-sided crystal shapes and superior hardness. This specimen appears to be vintage costume jewelry, likely using faceted blue glass or leaded crystal rather than natural gems.
More like this
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