sedimentary
Sandstone with Calcite Vein
Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling
Hardness: 6-7 (sandstone matrix), 3 (calcite vein); Color: Tan/brown with white crystalline streaks; Luster: Dull/earthy for matrix, vitreous for vein; Crystal structure: Granular matrix with rhombohedral calcite crystals; Cleavage: None (matrix), perfect rhombohedral (vein).
- Hardness
- 6-7 (sandstone matrix), 3 (calcite vein)
- Color
- Tan/brown with white crystalline streaks
- Luster
- Dull/earthy for matrix, vitreous for vein
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Physical properties
Hardness: 6-7 (sandstone matrix), 3 (calcite vein); Color: Tan/brown with white crystalline streaks; Luster: Dull/earthy for matrix, vitreous for vein; Crystal structure: Granular matrix with rhombohedral calcite crystals; Cleavage: None (matrix), perfect rhombohedral (vein).
Formation & geological history
Formed through the accumulation and cementation of mineral grains (mostly quartz) in marine or desert environments. The white vein formed later via hydrothermal activity or groundwater precipitation, where calcium-rich water filled fractures in the rock.
Uses & applications
Commonly used as a building material, in road construction, and for aquarium decor. Large, aesthetically pleasing specimens are used as garden stones or display pieces for collectors.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The white veins are often indicators of past fluid flow through a rock formation, which can be useful information for petroleum geologists.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel. If the white area reacts (fizzes) with diluted hydrochloric acid, it confirms the presence of calcite. Common in canyonlands and mountain ranges worldwide.
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