mineraloid

[ min-er-uh-loid ]
/ ˈmɪn ər əˌlɔɪd /

noun

a mineral substance that does not have a definite chemical formula or crystal form.

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Origin of mineraloid

First recorded in 1910–15; mineral + -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020