barytocalcite


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barytocalcite

A grey-yellow-white crystallised mineral composed of barium and calcium carbonates, with a chemical formula of BaCa(CO3)2, first seen in Cumbria (UK).
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References in periodicals archive ?
The mineral, at first thought to be a form of barytocalcite, is trimorphous with bary-tocalcite and paralstonite, and forms white to colorless or faintly pink acute pseudohexagonal pyramids or dipyramids up to 6 mm long.
Well-formed crystals of barytocalcite were also found.
Minor amounts of alstonite, barytocalcite and sphalerite were also encountered, but quartz was entirely absent.
Barytocalcite was observed mainly in large cavities in the lower part of the body.
Calcite, barytocalcite, podlesnoite, fluorite, astrophyllite, burbankite, lemmleinite-K and fluorapophyllite are the latest minerals found only in cavities.
Podlesnoite occurs as overgrowths on natrolite, ilmenite, biotite and barytocalcite in cavities.
Barytocalcite, BaCa(C[O.sub.3])[.sub.2], and fluorite, Ca[F.sub.2], are closely associated with podlesnoite.
The Blagill mine, about 6 km northwest of Nenthead, produced good barytocalcite (and has the unusual distinction of being the only locality in the world where that mineral was mined as an ore).
Species confirmed by X-ray diffraction during this study include alstonite, anglesite, ankerite, aragonite, barytocalcite, barite, brochantite, epsomite, harmotome, hydromagnesite, jarosite, marcasite, melanterite, millerite, serpierite, siderite, sulfur and witherite.
Alstonite was first described as a variety of barytocalcite, based on specimens from Brownley Hill mine, Cumbria and the Fallowfield mine, Northumberland, by James Johnston (1835).
Barytocalcite was first reported from the surface dumps of the Brownley Hill workings by Young (1985a), but specimens have not been located in situ despite extensive searches.
Despite the large number of localities in the northern Pennine orefield where barytocalcite or alstonite occur, a close association of the two polymorphs has not hitherto been recorded.