...Milen Kadiyski; Thomas Armbruster; Detlef Günther; Eric Reusser; Adolf Peretti Abstract The crystal structure of johachidolite, CaAl[B 3 O 7 ], ( Cmma , a = 9.767(2), b = 11.723(3), c = 4.3718(5) Å, V = 408.3(1) Å 3 , Z = 4) has been refined ( R 1 = 2.5 %) from a light-green gem-quality crystal...

...L. F. Aristarain; R. C. Erd Abstract The occurrence of two similar minerals at Jöhachidö, North Korea, may have been responsible for the various compositions suggested for johachidolite. Physical, optical, and X-ray data are reported for a specimen of johachidolite whose composition, CaAlB 3 0 7...

... Abstract E iichi I wase and N obueusa S aito , Johachidolite: a new mineral, a hydrous fluobor-ate of sodium, calcium, and aluminum. Sci. Papers Inst. Phys. Chem. Research Tokyo , 39 , 300-304 (1942); through Chem. Abs. , 41 ,6173 (1947) and private communication of authors to W. F. Foshag...

... with FBBs of this magnitude are sparse in number ( Grice et al. 1999 ). Among structures of the borate minerals, the only ones with FBBs greater than six are: kernite with a chain structure, strontioborite, ginorite, johachidolite and preobrazhenskite with sheet structures, and the boracite series...

... a sheet of 4-membered and 8-membered B-centered tetrahedra in the b-c plane (〈8□〉= 〈4□〉) has never been found among the natural borate structures. In fact, only johachidolite ( Moore and Araki 1972 ), Ca 2 Al 2 [B6O1 4 ] with an FBB consisting of a 6-membered ring of tetrahedra that shares an edge...

..., periclase, johachidolite, sodalite, taaffeite, ekanite, axinite, chondrodite, sinhalite, jeremejevite, kornerupine, etc. (e.g., Themelis 2008 and references therein; Harlow and Bender 2013 ; Guo et al. 2016 ; Wu et al. 2019 ). Gem mining in the MMB is thought to have started around 1044 AD ( Themelis...

... Crystallogr . B28 , 3559 – 3567 . Moore , P.B. & Araki , T. ( 1972 ): Johachidolite, CaAl[B 3 O 7 ], a borate with very dense atomic structure . Nature Phys. Sci . 240 , 63 – 65 . Moore , P.B. & Araki , T. ( 1974 ): Roweite, Ca 2 Mn 2+ 2 (OH) 4 [B 4 O 7 (OH...

... . Moore , P.B. & Araki , T. ( 1972 ): Johachidolite, CaAl[B 3 O 7 ], a borate with very dense atomic structure . Nature Phys. Sci . 240 , 63 – 65 . Moore , P.B. & Araki , T. ( 1974 ): Roweite, Ca 2 Mn 2+ 2 (OH)[B 4 O 7 (OH) 2 ]: its atomic arrangement . Am...

.... Example: A case simitar to that of johachidolite (Amer. Minerql. 62, 327), in which the elementsH' Na and F were found not to be essentialto the mineral, requires approval. Emmple: A casesimilar to that of sarcolite (Mineral, Mog 48, 107), in which it was shown that F is essentialto the mineral, requires...

...-IV: Candidate structure for a carbonate in the Earth's lower mantle . American Mineralogist , 102 , 1763 – 1766 . Moore , P.B. , and Araki , T. ( 1972 ) Johachidolite, CaAl[B 3 O 7 ], a borate with very dense atomic structure . Nature , 240 ( 99 ), 63 – 65 . Moore...

...) Strontioborite 5Δ3□ [(φ]<Δ2□>|<Δ2□>|<Δ2□>|2Δ Sr[B 8 O 11 (OH) 4 ] 9 d (29) Fabianite 2Δ4□ <Δ2□>=<4□>=<Δ2□> Ca 2 [B 6 O 10 (OH) 2 ] 9 e (30) Johachidolite 8□ <6□>=<4□> Ca 2 Al 2 [B 6 O 14 ] 9 f (31) Frameworks Diomignite 2Δ2...