>>2050114 most beach sand is quartz based. quartz is the most common mineral, and it definitely looks like it to me. probably a mineral deposit inside.
see if you can scratch it with a fingernail. lick it if you dare, is it salty? if the answer to both is no, the likelihood of quartz goes up. but seriously that crystal shape looks very much like quartz to me. someone could even have dropped it there.
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