sedimentary
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: tan/buff, Luster: dull/earthy, Crystal structure: clastic (granular), Cleavage: none, Specific gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan/buff, Luster: dull/earthy, Crystal structure: clastic (granular), Cleavage: none, Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (lithification). Most commonly found in ancient riverbeds, deserts, or coastal beach environments. Age can range from Holocene to Archean.
Uses & applications
Used widely as a construction material (dimension stone), in the manufacturing of glass, as a filter medium in water purification, and as an abrasive in industrial applications.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The famous red rocks of the Grand Canyon and the 'Wave' in Arizona are iconic sandstone formations. It is a major reservoir rock for petroleum and natural gas due to its porosity.
Field identification & locations
Identify in the field by its distinctive 'sandpaper' feel and visible grains. Common in outcroppings, riverbeds, and cliffs. Collectors should look for unique cross-bedding patterns or fossil inclusions.
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