sedimentary
Sandstone (likely River-tumbled Picture Sandstone)
Arenite (predominantly SiO2 with iron oxide impurities)
Hardness: 6-7 Mohs; Color: Tan, beige, and reddish-brown bands; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None/Conchoidal on grains; Specific gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, beige, and reddish-brown bands
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, beige, and reddish-brown bands; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None/Conchoidal on grains; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz and feldspar. The distinct banding (Liesegang rings) occurs as mineral-rich groundwater precipitates iron oxides into the porous rock over millions of years.
Uses & applications
Used in landscaping, as a building material, and for decorative lapidary work. Polished varieties are frequent in the crystal/metaphysical market.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The rhythmic banding seen here is often mistaken for wood grain or petrified wood, a phenomenon known as 'picture sandstone'.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible bedding planes. Common in desert environments, riverbeds, and ancient basins. It is a vital reservoir rock for water and petroleum.
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