29. Über Krokoit, Lautarit und Bietzeit und deren kristallographische Beziehungen

The crystal structure of synthetic lautarite, Ca(IO3)2

“…The cell dimensions and space group of lautarite were previously determined by Gossner & Mussgnug (1930). The cell dimensions (Table 1)have been determined from a least-squares refinement of 15 strong reflections with 20 values between 40 and 50 ° using Mo K~ radiation on an automatic single-crystal diffractometer.…”

The crystal structure of alstonite, BaCa(CO3)2: an extraordinary example of ‘hidden’ complex twinning in large single crystals

“…A complete set of mineralogical properties of the mineral is summarised by Roberts (1976 and references therein). Crystallographically, the mineral has been described as orthorhombic (Gossner and Mussgnug, 1930), monoclinic (Dickens, 1971) and triclinic (Sartoril 1975, Roberts, 1976, 1978. Dickens (1971) studied alstonite from the New Brancepath Colliery, Durham, England (Smithsonian specimen USNM 95869) and found a C-centred, monoclinic cell with a = 30.163(9), b = 17.413(5), c = 6.110(1) Å and β = 90.10(1)°, with a unit-cell volume 12 times larger than the orthorhombic cell proposed by Gossner and Mussgnug (1930).…”

“…The crystallographic information files have been deposited with the Principal Editor of Mineralogical Magazine and are available as Supplementary material (see below). Although the structural model was optimised in the P31m space group, we decided to also have a look at the structure using the C-centred orthohexagonal cell (with a ≈ 3 ½ ⋅b; i.e., a ≈ 30 Å, b ≈ 17.4 Å and c ≈ 6.1 Å), as reported by previous authors (Gossner and Mussgnug, 1930;Dickens, 1971;Sartori, 1975). The reflection data set was transformed according to the transformation matrix |210/010/001|, again taking into account the twin law that makes the twin lattice hexagonal (i.e.…”

Four monazite type structures: comparison of SrCrO4, SrSeO4, PbCrO4(crocoite), and PbSeO4

“…Crystallographic data were determined by Gossner and Mussgnug (1930) and Brill (1931). Crystallographic data were determined by Gossner and Mussgnug (1930) and Brill (1931).…”