Can you turn glass back into sand?

BBC Earth (Asia) - - Q & A -

Finely crushed glass is ba­si­cally a very pure form of sand. Tech­ni­cally, natural sand is made of quartz crys­tals of sil­i­con diox­ide, whereas glass is the non-crys­talline, amor­phous form of sil­i­con diox­ide. But when it is ground down enough, the dif­fer­ence isn’t ob­vi­ous. Crushed glass is sold as an al­ter­na­tive to sand for pool fil­ters – in fact, re­cy­cled crushed glass has been con­sid­ered as a par­tial re­place­ment for the sand on some of Florida’s erod­ing beaches. LV

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