fire sand

noun

Definition of fire sand

1 : a highly refractory sand that consists mainly of coarse quartz grains with alumina or clayey sand and that is used especially for foundry purposes
2 : a grayish green powder or granular refractory material obtained as a by-product in the manufacture of silicon carbide

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“Fire sand.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fire%20sand. Accessed 31 Oct. 2020.

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