...Bernard W. Evans; Scott M. Kuehner Abstract In two samples of antigorite serpentinite from Sasaguri, Kyushu, Japan, we have found trace amounts of a NiFe-rich silicate whose atomic proportions in terms of the ratio of M to T cations match those of the fibrous MgFe-silicate hydrate balangeroite...

...Giovanni Ferraris; Marcello Mellini; Stefano Merlino Abstract Electron-diffraction and transmission-electron microscopy ( tem ) investigations were carried out on the fibrous minerals balangeroite and gageite. The studies indicated for balangeroite a monoclinic unit cell with a m = 19.40, b m...

...Roberto Compagnoni; Giovanni Ferraris; Laura Fiora Abstract Balangeroite occurs as brown asbestiform fibers in a paragenesis with long-fiber chrysotile, magnetite, and native Fe-Ni in the Balangero serpentinite (Lanzo Valley, Piedmont, Italy). It is orthorhombic with a 13.85(4), b 13.58(3), and c...

... diopside, asbestiform carlosturanite, asbestiform forsterite, asbestiform sepiolite, asbestiform balangeroite, and asbestiform talc. The asbestiform non-silicates brugnatellite and brucite have been rarely detected. Outside the IWA, asbestiform zeolite (erionite and offretite), asbestiform sodium amphibole...

... the revised formula Mn 6 [W,Mg] 2 Si 2 (0,0H) ~l4 and space group P 3. Gageite, associated with franciscanite, has the composition Mn 38 84 -Mg 0.58 Fe 0.16 Si 15 (0,0H) 90 , supporting the occurrence of octahedral vacancies in gageite and balangeroite. Copyright © 1986 by the Mineralogical Society...

... the following chronological order: 1) balangeroite + chrysolite + magnetite + Ni-Fe alloys ± apatite veins; 2) antigorite + olivine + Ti-clinohumite + diopside + Mg-chlorite + magnetite veins; 3) antigorite + diopside veins; 4) lizardite ± chrysotile veins; 5) chrysotile veins. The first vein generation...

... ), a zeolite more carcinogenic than the six regulated asbestos minerals. This led to a new interest in the scientific community in investigating potentially hazardous non-asbestos fibrous minerals (e.g., balangeroite; Gazzano et al., 2005 ; Turci et al., 2005 ). The lack of a comprehensive scientific...

...FIGURE 2 Some minerals of concern: ( A ) balangeroite, a nonregulated asbestiform mineral (adapted from Groppo et al. 2005 ); ( B ) fluoro-edenite, a new carcinogen found close to the Etna volcano (Biancavilla, Sicily, Italy, adapted from Burragato et al. 2005 ); ( C ) commercial sample...

.... & Ferraris , G. ( 1991 ): New data on balangeroite and carlosturanite from Alpine serpentinites . Eur. J. Mineral . 3 , 559 – 566 . Compagnoni , R. , Ferraris , G. & Mellini , M. ( 1985 ): Carlosturanite, a new asbestiform rock-forming silicate from Val Varaita, Italy . Am...

... vibrations (880–1140 cm −1 ), Si-O-Si bending vibrations (412–538 cm −1 ), as well as a band of mixed vibrations at 705 cm −1 . The IR characteristics of the same vibrations in batisite are as follows: 880–1160, 407–525, and 708 cm −1 . In the series of minerals fukalite, batisite, and balangeroite, whose...

...Fig. 24. ( a , b , c ) Tetrahedral representations of the 2 T 4 chain in balangeroite and ( d ) a ball-and-stick representation of the chain. The structure of balangeroite projected ( e ) along the b -axis and ( f , g ) the two modes of linkage between 2 T 4 chains...

... in the structure of molybdophyllite are similar in their shape and periodicity to that in gageite and especially in balangeroite ( Ferraris et al. , 1987 ): in their structures the chains are grasped on both sides by 3×1 ribbons of octahedra, centred on Mn 2+ and Mg 2+ , respectively. In molybdophyllite...