sedimentary
Red Sandstone or Brick Fragment
Arenite (if sandstone)
Reddish-orange color, grainy texture, likely composed of quartz grains with iron oxide cement. Hardness varies depending on cementation but generally around 6-7 if quartz-rich. Dull earthy luster.
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Physical properties
Reddish-orange color, grainy texture, likely composed of quartz grains with iron oxide cement. Hardness varies depending on cementation but generally around 6-7 if quartz-rich. Dull earthy luster.
Formation & geological history
Sandstone forms from the lithification of sand-sized grains, often in desert or river environments. The red color is typically due to hematite (iron oxide). If it's a brick fragment, it's man-made from fired clay.
Uses & applications
Sandstone is widely used as a building material, in landscaping, and sometimes for paving.
Geological facts
Red sandstones are iconic in many landscapes, such as the American Southwest (e.g., Zion National Park, Sedona).
Field identification & locations
Identified by its sandy, granular texture that feels like sandpaper. It can be found globally in sedimentary basins. Look for distinct grains and sedimentary layers.
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