metamorphic
Quartzite with Iron Inclusions
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3)
Hardness: 7 on Mohs scale; Color: Grayish-tan base with orange/red iron staining; Luster: Dull to vitreous; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- Grayish-tan base with orange/red iron staining
- Luster
- Dull to vitreous
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 on Mohs scale; Color: Grayish-tan base with orange/red iron staining; Luster: Dull to vitreous; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, likely during mountain-building events (orogeny). The orange spots are oxidation of iron minerals like hematite or goethite.
Uses & applications
Primarily used in construction as crushed stone, road ballast, or as a decorative stone in landscaping and aquariums due to its durability.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, frequently forming the tops of ridges and mountains.
Field identification & locations
Identify by its ability to scratch glass and its granular, sugary texture. Commonly found in metamorphic terrains or as rounded river cobbles like the specimen shown.
More like this
