lansfordite
noun
lans·ford·ite
ˈlan(t)sfə(r)ˌdīt,
-anzf-
plural -s
: a mineral MgCO3.5H2O composed of a hydrous basic carbonate of magnesium like paraffin when first taken out of the ground but altering to nesquehonite on exposure
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Merriam-Webster unabridged
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