mineral
Likely rough amethyst
Amethyst, purple quartz (SiO₂)
AI-generated identification · may be incorrectThe small rough specimen appears pale lavender-gray with a darker purple edge; image detail is insufficient to confirm identification. Quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, with no true cleavage and conchoidal fracture.
Identified More mineral →
Explore Likely rough amethyst in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
The small rough specimen appears pale lavender-gray with a darker purple edge; image detail is insufficient to confirm identification. Quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, with no true cleavage and conchoidal fracture.
Formation & geological history
Amethyst forms when iron-bearing quartz crystallizes, commonly in gas cavities in volcanic rocks; deposits range from ancient to geologically recent.
Uses & applications
Used for jewelry, carvings, and mineral collecting; lower-grade material may be used decoratively.
Geological facts
Purple coloration is associated with trace iron and natural irradiation; heating can change amethyst’s color.
Field identification & locations
Look for purple coloration and quartz-like hardness, but confirm with closer inspection; well-known sources include Brazil, Uruguay, and Zambia. The image alone does not establish the specimen’s identity or locality.
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