dreikanter
Quick Summary
A dreikanter is a type of ventifact, which is a stone shaped by windblown sand. Specifically, a dreikanter is a pebble that has been eroded by windblown sand to create three distinct, curved facets. These facets are polished and flattened, and they form sequentially as the dominant wind direction changes, causing the stone to tumble and expose new surfaces to erosion. Dreikanters are typically found in arid environments and are usually made from hard, fine-grained rocks like quartzite, chert, or obsidian. The name "dreikanter" comes from German, meaning "one having three edges".12
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