mineral
Quartz Geode with Goethite/Hematite
Silicon Dioxide (SiO2) with Iron Oxides
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: Clear to smoky gray crystals on reddish-brown matrix, Luster: Vitreous/Glassy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal, Specific Gravity: 2.65
Identified More mineral →
Explore Quartz Geode with Goethite/Hematite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs scale), Color: Clear to smoky gray crystals on reddish-brown matrix, Luster: Vitreous/Glassy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal, Specific Gravity: 2.65
Formation & geological history
Formed by the precipitation of mineral-rich groundwater in cavities of volcanic or sedimentary rocks. The presence of red/brown coloration stems from iron oxide inclusions (Hematite/Goethite).
Uses & applications
Primarily used as decorative display specimens, educational tools, and by mineral collectors.
Geological facts
Geodes are essentially hollow rocks filled with crystals; this specimen shows a transition from clear quartz to iron-stained areas, creating a 'smoky' or 'morion' appearance in the darker zones.
Field identification & locations
Identify in the field by looking for rounded nodules that are lighter than similar-sized solid rocks. Found globally, especially in volcanic ash beds and limestone regions like the American Midwest or Brazil.
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
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
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