sedimentary
Quartz with Host Rock
SiO2 (Quartz) with fine-grained Matrix
Hardness: Quartz ~7, matrix variable (3-6). Color: Tan, cream, white, and dark greyish-blue. Luster: Dull to vitreous. Structure: Microcrystalline quartz vein with host rock pebble texture.
- Hardness
- Quartz ~7, matrix variable (3-6)
- Color
- Tan, cream, white, and dark greyish-blue
- Luster
- Dull to vitreous
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Physical properties
Hardness: Quartz ~7, matrix variable (3-6). Color: Tan, cream, white, and dark greyish-blue. Luster: Dull to vitreous. Structure: Microcrystalline quartz vein with host rock pebble texture.
Formation & geological history
Formed via hydrothermal vein deposition where silica-rich fluids precipitated quartz inside fractures of a host rock, subsequently eroded into a river pebble.
Uses & applications
Landscape decoration, educational specimens, or informal pebble collecting.
Geological facts
River pebbles showing sharp boundaries between vein quartz and dark host rock demonstrate geological hydrothermal activity.
Field identification & locations
Identify by contrasting light milky quartz/quartzite against a darker host rock matrix. Commonly found in riverbeds, gravel deposits, and beaches.
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