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Therefore cuivre sulfate is chalcanthite. Figure 8 is the stereographic projection that proves this identification.
The deep blue cuprian variety is often mistakenly called "chalcanthite" by the miners.
Ahlfeld and Munos Reyes (1955) reported romerite as crusts of rust-brown crystals in old workings, associated with chalcanthite, melanterite and pickeringite.
As a post-mining deposition in old underground workings, chalcanthite occurs as transparent to translucent blue vein-fillings and crusts with a somewhat coarse, fibrous structure, rarely associated with antlerite.
George Robinson (personal communication) has identified chalcanthite (by EDS) from the Flambeau mine, as post-mining coatings on sericite schist.
Blue stalactites (called "chalcanthite" by mine engineers) often turn out to be cuprian melanterite.
Primary Copper Minerals Secondary Copper Minerals Bornite Tenorite Antlerite Devilline Chalcopyrite Tetrahedrite Aurichalcite Langite Chalcocite Azurite Malachite Covellite Brochantite Metatorbernite Cuprite Calciovolborthite Metazeunerite Digenite Chalcanthite Olivenite Djurleite Chalcoalumite Parnauite Enargite Chrysocolla Vesignieite Lautite Conichalcite Volborthite Tennantite Cyanotrichite Zeunerite The Supergene Copper Minerals of Bisbee, Arizona
Melanterite FeS[O.sub.4][center dot]7[H.sub.2]O and Chalcanthite CuS[O.sub.4][center dot]5[H.sub.2]O
On level 33 it is extremely common in octahedral crystals to 3 mm on halotrichite, pink coquimbite, red botryogen, blue chalcanthite, brown jarosite, yellow copiapite and many other complex sulfates .