metamorphic
Yellow Quartzite (or Yellow Chalcedony Pebble)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Yellow, orange-buff; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Yellow, orange-buff
- Luster
- Vitreous to waxy
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: Yellow, orange-buff; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, or as a secondary silica deposit in sedentary environments. This specimen appears water-worn, likely from a fluvial (river) or glacial environment.
Uses & applications
Used as decorative gravel, in landscaping, as a gemstone (when high quality), or in the manufacture of glass and abrasives if in high purity.
Geological facts
Quartz is one of the most abundant minerals on Earth. Yellow coloration in quartz is often caused by trace amounts of iron hydroxides like goethite or limonite within the structure.
Field identification & locations
Identify by its hardness (it will scratch glass), its lack of cleavage, and its translucent quality when held to light. Commonly found in riverbeds, beaches, and glacial till worldwide.
More like this
