...William C. Hood; Peter F. Steidl Abstract Benstonite, MgCa 6 Ba 6 (CO 3 ) 13 , has been synthesized at room temperature by mixing a solution containing 12.5 ml of 0.2 molar MgCl 2 12.5 ml of 0.2 molar BaCl 2 and 5.0 ml of 0.1 molar CaCl 2 with 25 ml of 0.5 molar sodium carbonate solution...

...Friedrich Lippmann Abstract Benstonite, (Ca,Mg,Mn) 7 (Ba,Sr) 6 (CO 3 ) 13 , was found at the barite mine in Hot Spring County, Arkansas, where it occurs in veins within the barite body associated with milky quartz, barite and calcite. It forms white cleavable masses which show cleavage faces up...

...-ultrabasic-alkalic rocks through basic and intermediate ones to alkali granites and unique residual calc-silicate rocks (benstonite Ba-Sr carbonatites and charoite rocks). Also, intrusive equivalents of lamproites occur in these massifs, and the Murun massif was probably formed from highly differentiated...

...B. E. Scheetz; W. B. White Abstract Raman spectra and mid-range and far infrared spectra have been measured on polycrystalline norsethite [BaMg(C0 3 ) 2 ], barytocalcite [BaCa(CO 3 ) 2 ], the high-temperature modification of barytocalcite, huntite [CaMg 3 (C0 3 ) 4 ], benstonite [Ca 7 Ba 6 (CO 3 )i...

... of hydrothermal origin. Its optical properties, X-ray powder data and chemical composition are given, and its behaviour towards the staining reagent, sodium rhodizonate, discussed. Associated barium-bearing minerals are celsian, barite, barytocalcite and benstonite. Copyright © 1967 by the Mineralogical Society...

... feldspatite, K-feldspar-pyroxene and quartz-calcite-K-feldspar-pyroxene rocks, charoite-bearing rocks of different varieties, and carbonatites (benstonite, calcite, and quartz-calcite containing abundant graphic textures). The rocks of this series occupy an area of 10 km 2 in the southeastern near-contact...

...-forming phases are carbonates (calcite, dolomite, ankerite or siderite, benstonite, Na–Ca carbonates, and others) and Mg-rich silicates such as forsterite, diopside, (Na)–Ca–Mg amphiboles, phlogopite–biotite mica and paragenetically late clinochlore, and serpentines or vermiculite ± magnetite...

... al ., 2013a ), cymrite, benstonite ( Biagioni & Orlandi, 2010 ), and a new member of the crichtonite group (Biagioni et al ., in prep.). At present, the most promising field of research is related to thallium sulfosalts, as confirmed by the recent approvals of the two new minerals boscardinite...

... dolomite CaMg(CO 3 ) 2 spotted rings good (0.7–0.8) inclusions b 36-0426 benstonite Ca 7 Ba 6 (CO 3 ) 13 spotted rings fair (0.5–0.7) inclusions b 14-0637 ikaite CaCO 3 ·6H 2 O spotted rings fair (0.5–0.7) inclusions b 37-0416 forsteritic olivine (Mg,Fe) 2 SiO 4 spots...

...-Mg calcite ( Glover and Sippel 1967 ; Kitano and Kanamori 1966 ) and benstonite [MgCa 6 Ba 6 (CO 3 ) 13 ] ( Hood and Steidl 1973 ) at room temperature within relatively short timescales clearly shows that the formation of unordered anhydrous carbonate minerals with moderate magnesium contents can...

... to baryte, a few other minerals having Ba as a primary constituent are currently known: benstonite, cymrite and mannardite – all identified from the Monte Arsiccio mine (Biagioni et al. , 2009 ; Biagioni and Orlandi, 2010 ). Similarly to mannardite, Ba in bianchiniite is associated with Ti and V...

... dolostones the Tl-Hg-As-Sb-(Ag,Cu)-Pb sulfosalts form a network of tiny irregular veinlets 50 µm to 1 mm thick and 0.5–5 cm long ( Fig. 1B ), or small pockets associated with microcrystalline dolomite, pyrite, and barite and minor amounts of calcite, cymrite, and benstonite. The veinlets cut the foliation...

...-analogue of cleusonite. Nowadays, the most interesting locality is represented by the Monte Arsiccio mine; its mineralogy is currently under study and a number of rare phases have been identified: mannardite ( Biagioni et al ., 2009 ), cymrite and benstonite ( Biagioni & Orlandi, 2010 ), two new...

... of aegirine, feldspar, tinaksite and some other rather uncommon minerals. The metasomatic rock also exhibits a complex association with unusual minerals such as charoite, canasite, fedorite, ekanite, miserite, tinaksite, benstonite, tokkoite, murunskite, frankamenite and davanite, together with other more...

...; the final phase is represented by a banded layered complex of potassic silicate-carbonate rocks, potassic microsparites, and quartz-calcite-K-feldspar-pyroxene rocks containing schlieric and veined bodies of carbonatites (calcitic, benstonitic, quartz-calcitic, and charoitic). Hydrothermal veins and zones...

... was recently started; it allowed the identification and characterization of some rare minerals, e.g., ankangite: Biagioni et al . (2009) , benstonite: Biagioni & Orlandi (2010) , chabournéite: Bonaccorsi et al . (2010) , cymrite: Biagioni & Orlandi (2010) , associated with more common species...

... to 0.5 m in thickness. Varieties of “carbonatite” present include calcite carbonatite, Ba–Sr–Ca carbonatite or benstonite carbonatite, and phlogopite calcite carbonatite. Also present are aegirine carbonatite, titanite carbonatite, and quartz calcite carbonatite (torgolite). The “carbonatites...

..., genesis, and ore reserves . Russian Geology and Geophysics , 50 , 1119 – 1128 . Vladykin N.V. Tsaruk I.I. ( 2003 ) Geology, chemistry and genesis of Ba-Sr-bearing (“benstonite”) carbonatites of the Murun Massif . Russian Geology and Geophysics , 44 , 315 – 330 . 1 Deposit...

... region is poorly resolved, which makes the main characteristic features in the far IR range difficult to identify. Far IR transmittance spectra (4000 to 30 cm −1 ) of various alkaline earth double carbonates (huntite, alstonite, norsethite, baritocalcite, and benstonite) are reported in Scheetz...

... ( Richards, 1999 ). Barium-rich carbonate ore bodies ( e.g. the Northern Orefield No 1) consist of evenly coloured white to greyish barium-rich zones in a grey dolomite, containing various combinations of the following minerals: norsethite (BaMg(CO 3 ) 2 ) benstonite ((Ca,Mg,Mn) 7 (Ba,Sr) 6 (CO 3 ) 13...