...Yu-Chyi Yau; Donald R. Peacor Abstract tem images of jerrygibbsite from Franklin, New Jersey, reveal random and ordered mixed layering with leucophoenicite on (001) and periodic twinning that gives rise to complex superperiodicites within the leucophoenicite. The differences between the structures...

...Mark D. Welch; William G. Marshall; Nancy L. Ross; Kevin S. Knight Abstract The proton positions in leucophoenicite, ideally Mn 7 Si 3 O 12 (OH) 2 , have been determined by neutron powder diffraction under ambient conditions on a natural sample from Franklin, New Jersey. Refinement in the P 2 1...

... alternating with thinner goethite-like (G) slabs in the ordered arrangements O ∞ , OOOG, and OG. Leucophoenicite, OOOG, containing the same kind of slabs, represents the only macroscopic member of the leucophoenicite series (White and Hyde, 1983). It has the same slab sequence as the hydrous B phase; lamellar...

...) for all reflections. Ribbeite is structurally related to leucophoenicite in that it contains serrated, edge-sharing chains of Mn octahedra and two distinct types of Si tetrahedral sites: (1) a single, isolated, fully occupied Si tetrahedron, and (2) a pair ofedge-sharing, half-occupied Si tetrahedra...

... mcgovemite in the absence of Zn, and the substitution of Al for most of the Fe 3+ . Analytical data for two new occurrences of leucophoenicite, from the Kombat mine and from the Italian Alps, show that this mineral is Ca-bearing, does not contain essential Zn, and has not yet been found as the ideal end...

... of the leucophoenicite group having octahedron sequence (1,2 2 ) 2 and is the unit-cell-twinned equivalent of alleghanyite. It occurs in Mn-rich silicate-carbonate units within lenses of manganese oxide ores as equigranular grains associated with alleghanyite, manganoan calcite, pyrochroite, chlorite, galaxite...

...Pete J. Dunn; Donald R. Peacor; William B. Simmons; Eric J. Essene Abstract Jerrygibbsite, ideally Mn 9 (SiO 4 ) 4 (OH) 2 , is polymorphous with the Mn-humite sonolite, and a probable member of the leucophoenicite group. It occurs as intergrown grains with a typical metamorphic texture at Franklin...

...Timothy J. White; Bruce G. Hyde Abstract Three leucophoenicite specimens were examined in the transmission electron microscope and by X-ray powder diffraction and electron-probe microanalysis. A comparison of observed and computer-simulated structure images supports Moore’s proposals...

...Paul B. Moore Abstract Leucophoenicite, a 10.842 (19), b 4.826 (6), c 11.324 (9) Å, β 103.93° (9), P2 1 /a, possesses the crystallochemical formula Mn 7 [SiO 4 ] 2 [(SiO 4 )(OH) 2 ], with two formula units in the crystal cell. The atomic arrangement was deciphered from Patterson synthesis; atomic...

... to be a valid species, identical with the materia] of Palache (1910), but the later studies of this mineral by Palache (1928, 1935) and Moore (1967) are composite descriptions of leucophoenicite, sonolite and alleghanyite. Some still undescribed chemical variants of minerals in the chondrodite and olivine...

...Paul B. Moore Abstract Leucophoenicite, 3Mn 2 SiO 4 ·Mn(OH) 2 , is generally regarded as a member of the manganese humite group. However, unlike the monoclinic members alleghanyite, 2Mn 2 SiO 4 ·Mn(OH) 2 , and sonolite, 4Mn 2 SiO 4 ·Mn(OH) 2 , which seem to be normal members of the manganese humite...

...Pete J. Dunn Abstract The manganese humites, (alleghanyite, manganhumite, and sonolite), together with some Mn-bearing samples of the Mg-humites, and the related phases leucophoenicite and jerrygibbsite, from the orebodies at Franklin and Sterling Hill, New Jersey, are described together...

...F ig . 1. Photomicrograph showing an imperfect octahedron of brownish yellow oxyplumboroméite on a matrix of calcite (white) and leucophoenicite (pink). ...

.... The arrangement of cation octahedra within a single chain has the same basic structural unit of five edge-sharing octahedra found in olivine, the humite group, and leucophoenicite. Carmichaelite is inferred to have co-precipitated with its pyrope host and other titanates in the presence of a fluid or melt phase...

...Joel D. Grice; Pete J. Dunn Abstract Sclarite, ideally (Zn,Mg,Mn) 4 Zn 3 (CO 3 ) 2 (OH) 10 , is a new mineral species from the Franklin mine, New Jersey. It occurs as 1.5-mm clusters of clear, colorless crystals associated with leucophoenicite, gageite, zincite, and willemite. The mineral has...

...); moderate dispersion, r < v ; X = b, Z ∧ c = 45(3)°. Holdawayite forms coarse veins cutting silicate-facies Mn-bearing rocks with assemblages including humite- and/or leucophoenicite-group minerals. Idealized Cl-free holdawayite, Mn 3 (CO 3 )(OH) 4 , may form by hydration of rhodochrosite and in turn may...