sedimentary
Sandstone with Quartz/Calcite druse
Arenite with druse (SiO2 or CaCO3)
Hardness: 6-7 (if quartz) or 3 (if calcite); Color: Tan, beige, reddish-brown; Luster: Dull to vitreous; Structure: Granular sedimentary with small crystal encrustations.
- Hardness
- 6-7 (if quartz) or 3 (if calcite)
- Color
- Tan, beige, reddish-brown
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (if quartz) or 3 (if calcite); Color: Tan, beige, reddish-brown; Luster: Dull to vitreous; Structure: Granular sedimentary with small crystal encrustations.
Formation & geological history
Formed by the cementation of sand-sized mineral particles or rock fragments, following burial and lithification. The crystalline layer (druse) formed later from mineral-rich fluids passing through cavities.
Uses & applications
Commonly used in construction as building stone, pavers, and crushed stone. Small druzy specimens are collected for their aesthetic crystalline texture.
Geological facts
Sandstone can be found in almost every environment where there is water, such as deserts, rivers, and oceans. The color is usually determined by the minerals that act as the cement, such as iron oxide.
Field identification & locations
Identify by the gritty sand-paper feel of the matrix and the presence of small, sparkling mineral points. Common in sedimentary basins and outcrops globally.
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