Mineralogy, blue vitriol.

1855–60; < Latin chalcanth(um) (< Greek chálkanthon blue vitriol, literally, flower of copper, equivalent to chalk(ós) copper + ánth(os) flower + -on neuter suffix) + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chalcanthite (kælˈkænθaɪt)
a blue secondary mineral consisting of hydrated copper sulphate in triclinic crystalline form. Formula: CuSO4.5H2O
[C19: via German from Latin chalcanthum copper sulphate solution, from Greek khalkanthon, from khalkos copper + anthos flower; see -ite1]

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Encyclopedia Britannica


a widespread sulfate mineral, naturally occurring hydrated copper sulfate, CuSO45H2O. It occurs in the oxidized zone of copper deposits and is frequently found on the timbers and walls of mine workings, where it has crystallized from mine waters. It was formerly an important ore mineral in Chile and was a minor ore at Butte, Mont. At one time large quantities were shipped to the Comstock Lode in Nevada, where it was used to reduce silver ores. Its blue crystals dehydrate to an opaque greenish-white powder on exposure to dry air. For detailed physical properties, see sulfate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Chalcanthite is the dominant copper sulfate mineral although others may also be present.
Chalcanthite is the dominant copper sulfate mineral although others also may be present.
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