sedimentary
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
Hardness: 7 (quartz) / 6-6.5 (matrix); Color: Clear, pink, and grey; Luster: Vitreous to dull; Crystal Structure: Trigonal/Amorphous; Specific Gravity: 2.65
- Hardness
- 7 (quartz) / 6-6
- Color
- Clear, pink, and grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (quartz) / 6-6.5 (matrix); Color: Clear, pink, and grey; Luster: Vitreous to dull; Crystal Structure: Trigonal/Amorphous; Specific Gravity: 2.65
Formation & geological history
Formed through the accumulation of sand-sized mineral grains and subsequent cementation (sedimentary process). The visible crystals represent secondary mineralization or porphyritic inclusions within the matrix.
Uses & applications
Primarily used for geological study, education, and as a low-cost collector specimen. Sandstone is used in construction and paving.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The presence of clear and pinkish crystals suggests a diverse mineral source, possibly from degraded granite.
Field identification & locations
Identify by the gritty texture of the matrix and the hardness of the embedded crystals. Commonly found in riverbeds, deserts, and sedimentary basins worldwide.
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