Reevesite [Ni.sub.6][Fe.sub.2](C[O.sub.3])(OH)[.sub.16] * 4[H.sub.2]O
Light yellowish-green flakes of reevesite occur within the serpentinite adjoining the silica-carbonate rock of the Clear Creek mine.
This former nickel mine is the type locality for heazlewoodite and hellyerite, and the source of many rare minerals, including awaruite, dypingite, retgersite, reevesite, theophrastite and several new, unnamed minerals.
A lemon-yellow crust on serpentine gives an X-ray powder diffraction pattern close to that of reevesite, and qualitative EMPA indicates Ni:Fe approximately 3:1, confirming the composition.
Reevesite is rarer and appears to derive from reaction of carbonate-rich waters with nickel and ferric iron released from the oxidation of awaruite and pentlandite.
Bish and Livingstone (1981) describe from another locality a citrine-yellow encrusting film associated with chromite consisting of a mixture of reevesite, honessite and hydrohonessite.
(1981) The crystal chemistry and paragenesis of honessite and hydrohonessite: the sulphate analogues of reevesite. Mineralogical Magazine, 44, 339-343.
Carbonate Zone Minor Phases Rare Phases Upper paratacamite, carrboydite, kambaldaite, annabergite, glaukosphaerite, azurite, lavendulan, hydrohonessite, retgersite, nepouite, nullaginite, pyrolusite, huntite, olivenite, otwayite, aragonite, calcite, pecoraite pharmacosiderite, [+ or -] dolomite reevesite, takovite, widgiemoolthalite Lower paratacamite, dolomite, kambaldaite huntite Weathered metabasalt immediately adjacent to the gaspeite veins in the upper carbonate zone contains only thin (0.1-5 mm) coatings of lavendulan, gypsum and minor azurite along joint planes.
Reevesite [Ni.sub.6][Fe.sub.2]([CO.sub.3])(OH)[sub.16][multiplied by]4[H.sub.2]O
Reevesite appears to be a rare mineral at Widgiemooltha.