...P. B. Moore; T. Araki Abstract overite, [Mg(H 2 O 4 ] 2 [Ca 2 Al 2 (OH) 2 (PO 4 ) 4 ], Z = 4, a = 14.723(14), b = 18.746(16), c = 7.107(4) A, orthorhombic, space group Pbca ; and segelerite, [Mg(H 2 O) 4 ] 2 [ C a 2 F e 2 3 + ( O H ) 2 ( P O 4 ) 4 ] , Z = 4, a = 14.826(5), b = 18.751(4), c = 7.307...

... (—), 2 v large, α 1.618,β 1.635, γ 1.650, occurs sparingly as striated yellow-green prismatic crystals, with a {100}, b {010}, m {110} and q {121} with perfect {010} cleavage. It is the Fe 3+ -analogue of overite; a restudy on type overite reveals the space group Pcca and the ideal formula CaMg(H 2 o) 4...

...Esper S. Larsen, 3d. Abstract Overite, Ca 3 Al 8 (PO 4 ) 8 (OH) 6 ·15H 2 O, is a new mineral from the variscite nodules of Fairfield, Utah. It is orthorhombic and occurs as pale green to colorless prismatic crystals, flattened on b {010}, in cavities in altered variscite. Cleavage: {010} perfect...

...-rich overite are among the less closely associated phosphates; this assemblage may be secondary, following apparent dissolution of lithiophosphate and possibly of primary lithiophilite. Groatite is translucent, colorless to pale yellow and pale orange with a white streak and vitreous luster; it does...

...; these are, in their probable sequence, gordonite, englishite, montgomeryite, overite, and sterrettite. The third stage represents the deposition of a small amount of pseudowavellite, and the fourth, the deposition of the members of the apatite group. Each of these stages has characteristic chemical qualities. The variscite...

... the original model of Moore & Araki (1977) . From the refined Al/Fe occupancies in the Fe site the formula for the Mt. Deverell segelerite is Ca 2 Mg 2 Fe 1.43 3 + Al 0.57 (PO 4 ) 4 (OH) 2 (H 2 O) 8 , corresponding to a solid solution of dominant segelerite with minor overite, Ca 2 Mg 2 Al...

... grateful to Guy Hovis, Bob Smith, Phil Long, and Gilbert Griego for their help in preparing this memorial. I thank Terry Gugliotta for the photograph of Art taken at the Harding pegmatite in 1994. References cited E.S. Larsen , 3 rd ( 1940 ) Overite and montgomeryite: two new minerals...

... assemblage include collinsite, gordonite, overite, and whitlockite. Whiteite-(CaMgMg) is a low temperature, secondary mineral presumed to have formed as a result of hydrothermal alteration. A major serpentinite body in proximity to the deposit shows evidence of intense hydrothermal alteration...

..., kingsmountite, kipushite, kovdorskite, lazulite, lun’okite, lüneburgite, mangangordonite, mariæite, meta-natroautunite, metavanmeersscheite, meurigite, minyulite, monazite-(La), monazite-(Nd), montgomeryite, nabaphite, nacaphite, nahpoite, nastrophite, nefedovite, nevadaite, niahite, nissonite, olgite, overite...

... . Moore , P.B. ( 1974 ): I. Jahnsite, segelerite and robertsite, three new transition metal phosphate species. II. Redefinition of overite, an isotype of segelerite . Am. Mineral . 59 , 48 – 59 . Moore , P.B. & Araki , T. ( 1974 ): Jahnsite CaMn 2+ Mg 2 (H 2 O) 8 Fe 8+ 2 (OH...

... , 245 pp . Moore, P.B. (1974) I. Jahnsite, segelerite, and robertsite, three new transition metal phosphate species. II. Redefinition of overite, an isotype of segelerite. III. Isotypy of robertsite, mitridatite...

...Figure 21. The crystal structures of overite, tancoite and sinkankasite: (a) overite projected onto (010); (b) overite projected onto (001); Ca atoms are shown as small shaded circles; (c) tancoite projected onto (100); (d) tancoite projected onto (001); Na atoms are shown as small shaded...

... , ( Moore and Araki 1974 ) overite, [Ca 2 Al 2 (PO 4 ) 4 (OH) 2 ][Mg(H 2 O) 4 ] 2 ( Moore and Araki 1977 ), and segelerite, [Ca 2 Fe 3+ 2 (PO 4 ) 4 (OH) 2 ][Mg(H 2 O) 4 ] 2 ( Moore and Araki 1977 ). The main difference between sideronatrite and guildite is in the different types of sheet structure...

... occurs as a 5–10 cm mass composed primarily of rhodochrosite, quartz, whitlockite, apatite, fairfieldite, an unidentified Na–Al phosphate, calcite, and crandallite, with minor overite, groatite, and metaswitzerite; a small mass of sphalerite with inclusions of galena and bismuthinite is also present...

... , 23 – 39 . Larsen , E.S. ( 1940 ): Overite and montgomeryite: two new minerals from Fairfield, Utah . Am. Mineral. , 25 , 315 – 326 . Lafuente , B. , Downs , R.T. , Yang , H. , Jenkins , R.A. ( 2014 ): Calcioferrite with composition (Ca 3.94 Sr 0.06 )Mg...

.... , 21 , 1073 – 1080 . Moore , P.B. ( 1974 ): Jahnsite, segelerite, and robertsite, three new transition metal phosphate species. II. Redefinition of overite, an isotype of segelerite. III. Isotypy of robertsite, mitridatite, and arseniosiderite . Am. Mineral. , 59 , 48 – 59...

... , 964 – 973 . Moore , P.B. & Araki , T. ( 1977 ): Overite, segelerite, and jahnsite: a study in combinatorial polymorphism . Am. Mineral . 62 , 692 – 702 . Pouchou , J.L. & Pichoir , F. ( 1984 ): A new model for quantitative analysis. I. Application...

... of overite, an isotype of segelerite. III. Isotypy of robertsite, mitridatite, and arseniosiderite . American Mineralogist 59 , 48 – 59 . Moore, P.B. & Araki, T. (1974) Jahnsite, CaMn 2...

.... Jahnsite, segelerite and robertsite, three new transition metal phosphate species. II Redefinition of overite, an isotype of segelerite. III. Isotypy of robertsite, mitridatite and arseniosiderite . American Mineralogist , 59 , 48 – 59 . Moore P.B. Araki T. ( 1974 ) Jahnsite, CaMn 2...