| shatter cone n. A conical fragment of rock that is formed from the high pressure of volcanism or meteorite impact and has striations radiating from the apex. |
shatter cone (sh t  r) A fractured, conical fragment of rock that has striations radiating outward from the apex. Shatter cones are believed to form when rocks are subjected to shock waves associated with a meteoric impact. They are typically between a few centimeters and a few meters long. |
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