sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
Hardness: 6-7 (Mohs scale), Color: tan/beige, Luster: dull/earthy, Crystal structure: microcrystalline quartz, Cleavage: none, Specific gravity: 2.65
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan/beige, Luster: dull/earthy, Crystal structure: microcrystalline quartz, Cleavage: none, Specific gravity: 2.65
Formation & geological history
Formed through the weathering and erosion of pre-existing rocks, transport by water or wind, and deposition in environments like riverbeds or beaches. This specific grain likely broke off from a larger sandstone formation.
Uses & applications
In bulk, sandstone is used for construction, glass manufacturing, and as a reservoir rock for oil and gas. Individual grains help form soil and beach environments.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth and makes up approximately 20% of all sedimentary rock in the Earth's crust.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and its ability to scratch glass if quartz-rich. Commonly found in deserts, river basins, and coastal areas.
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