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).
References in periodicals archive ?
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, fluorite and barytocalcite were found in the cavities, but podlesnoite was not.
Podlesnoite occurs as overgrowths on natrolite, ilmenite, biotite and barytocalcite in cavities.
Barytocalcite was formed earlier than the new mineral, whereas fluorite was formed later.
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.
Thus the alstonite area near Holmes' rise on the High Cross vein, which also hosts the uncommon primary minerals barytocalcite and hydromagnesite, is immediately south of the point where an ankerite-dominated vein assemblage gives way to a barium-dominated assemblage.