mineral
Quartz Geode fragment
Crystalline Silicon Dioxide (SiO2)
Mohs hardness: 7; Color: White to colorless; Luster: Vitreous (glassy); Crystal structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7
- Color
- White to colorless
- Luster
- Vitreous (glassy)
Identified More mineral →
Explore Quartz Geode fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness: 7; Color: White to colorless; Luster: Vitreous (glassy); Crystal structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed via hydrothermal deposition or precipitation within volcanic or sedimentary cavities (vugs) as silica-rich water cools or evaporates. These can range from millions to hundreds of millions of years old.
Uses & applications
Used primarily for crystal collecting, home decor, and as educational specimens. Higher quality quartz is used in jewelry and specialized glass manufacturing.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Geodes are unique because they are hollow rocks that provide a protected environment for crystals to grow inward.
Field identification & locations
Identified by its hexagonal crystal points, inability to be scratched by a steel knife, and geode-like vug structure. Often found in desert regions or limestone beds.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous