mineral
Amethyst Geode Fragment
Quartz (SiO2) with trace iron impurities
Hardness: 7 (Mohs); Color: Deep purple to pale lavender; Luster: Vitreous; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65
- Hardness
- 7 (Mohs)
- Color
- Deep purple to pale lavender
- Luster
- Vitreous
Identified More mineral →
Explore Amethyst Geode Fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs); Color: Deep purple to pale lavender; Luster: Vitreous; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65
Formation & geological history
Formed in volcanic or sedimentary cavities (geodes) where mineral-rich hydrothermal fluids precipitate crystals over millions of years
Uses & applications
Jewelry, decorative home decor, crystal healing collections, and lapidary arts
Geological facts
Amethyst was considered a precious gem alongside diamonds and rubies until large deposits were found in Brazil. Its name translates from Greek as 'not intoxicated'
Field identification & locations
Field identification involves looking for purple hexagonal crystal points inside a rocky shell. Primarily found in Brazil, Uruguay, and North America
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock