sedimentary
Sandstone (with garnet granules)
Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)
Hardness: 6.5-7.5 (for the garnet crystals), 6-7 (overall); Color: Pinkish-red to brownish; Luster: Vitreous to dull; Crystal structure: Isometric (garnets); Specific Gravity: 2.6 - 4.3
- Hardness
- 6
- Color
- Pinkish-red to brownish
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7.5 (for the garnet crystals), 6-7 (overall); Color: Pinkish-red to brownish; Luster: Vitreous to dull; Crystal structure: Isometric (garnets); Specific Gravity: 2.6 - 4.3
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments. The pinkish hue suggests the presence of iron oxides or garnet sand concentrated by wave or wind action in high-energy environments like beaches.
Uses & applications
Common sandstones are used in construction and masonry. If high in garnet content, it can be used for abrasives (sandblasting) or water filtration.
Geological facts
Certain beaches, like 'Pfeiffer Beach' in California, are famous for their purple/pink sand which is composed of manganese garnet washed down from nearby hills.
Field identification & locations
Identify by its gritty texture and the presence of small, sparkling translucent grains. Often found in eroded coastal regions or desert basins with high mineral diversity.
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