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mineraloid

[min-er-uh-loid] /ˈmɪn ər əˌlɔɪd/
noun
1.
a mineral substance that does not have a definite chemical formula or crystal form.
Origin
1910-1915
1910-15; mineral + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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