sedimentary
Quartz Vein in Sandstone
Sandstone with Hydrothermal Quartz (SiO2)
Hardness: 6.5-7 (Mohs); Color: Reddish-brown (oxidized) host rock with a translucent white crystalline vein; Luster: Dull/earthy host with vitreous vein; Structure: Clastic grain texture with a secondary crystalline vein.
- Hardness
- 6
- Luster
- Dull/earthy host with vitreous vein
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Reddish-brown (oxidized) host rock with a translucent white crystalline vein; Luster: Dull/earthy host with vitreous vein; Structure: Clastic grain texture with a secondary crystalline vein.
Formation & geological history
Primary sandstone formed via deposition and lithification of sand grains. The white vein formed later via hydrothermal activity, where silica-rich fluids filled fractures in the rock. Frequently found in regions with ancient tectonic activity.
Uses & applications
Common specimen for geological study. Sandstone is used in construction and landscaping; quartz is used in electronics and glass manufacturing. This specific piece is a hobbyist's pocket stone.
Geological facts
The red color in the host rock is typically caused by iron oxide (hematite) staining of the cement holding the sand grains together. These 'veined' rocks often tell a story of seismic activity that cracked the original rock, allowing fluids to seep in.
Field identification & locations
Identify in the field by the distinct contrast between the grain-based host rock and the glass-like crystalline band. Hardness tests will show the vein cannot be scratched by a steel knife. Found globally in riverbeds and mountainous regions.
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