 | | Journal (article/letter/editorial) | | Google seemed to average twelve states (North Dakota, South Dakota, Nebraska, Kansas, Minnesota, Iowa, Missouri...Mineral Show® committee annexed a chunk of the South to this core and chose to feature sixteen “Midwest”...per state. Four states— Michigan, Wisconsin, South Dakota, and Arkansas—at the periphery of the area tally...described from just one mine, the Tip Top, in South Dakota. (Note: There are no type locality occurrences...occurrences in only four Midwestern states: North Dakota, Nebraska, Oklahoma, and Kentucky; these might still |  | | Report (issue) | | Fe2+Ta2O6 Tantalite-(Fe) Crystal Data: Orthorhombic. Point Group: 2/m 2/m 2/m. Commonly as exsolution...exsolution intergrowths with tapiolite-(Fe). Physical Properties: Cleavage: {100}, distinct; {010}, less distinct...Data: Space Group: [Pbcn](by analogy to columbite-(Fe)). a, b, and c = n.d. Z = [4] X-ray Powder Pattern:...a.d. Drau, Austria; by electron microprobe, total Fe as FeO; corresponds to (Fe0.78Mn0.20)Σ=0.98Ti0.03(Ta1...tapiolite-(Fe); forms series with tantalite-(Mg) and tantalite-(Mn), and with columbite-(Fe). Mineral |  | | Book (edition) | | OX5 1 GB, UK 225 Wyman Street, Waltham, MA 02451, USA Copyright © 2015, 2008 Elsevier B.V. All rights reserved...geochemistry were by Harris and Burke (1970), Lawrence (1998), Makeyev et. al. (1999), Mücke et al. (1999)...overgrowth by its darker colour that relates to its higher Fe content and its hexagonal shape, while it is completely...end-member compositions; another example is Mg and Fe in olivine. Crystallographic System & Point Group...(light to dark greys); betekhtinite (homogenous upper grey rim). Opacity/Diaphaneity Most minerals described |
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