...Elena Belluso; Elisa Fornero; Simona Cairo; Giovanni Albertazzi; Caterina Rinaudo Abstract Carlosturanite, a mineral with a serpentine-like structure, grows mainly with a fibrous habit. We have analyzed samples with both pure carlosturanite and associations of carlosturanite and chrysotile using...

...Roberto Compagnoni; Giovanni Ferraris; Marcello Mellini Abstract Carlosturanite is a new rock-forming silicate occurring in a network of veins crosscutting the antigorite serpentinite of Sampeyre in the Monviso ophiolite, Italy. It is light-brown, asbestiform, and the [010] fibers are paralleled...

...Marcello Mellini; Giovanni Ferraris; Roberto Compagnoni Abstract Carlosturanite, ideally M 21 [T 12 O 28 (OH) 4 ](OH) 30 · H 2 O, is a water and magnesium-rich, silicon-poor serpentine-like asbestiform mineral. TEM techniques revealed the fiber texture, which consists of randomly rotated fibers...

... 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...

... as one end-member and a sheet structure as the other, including the biopyriboles and the carlosturanite series. Antigorite samples having different modulation wavelengths are an example of a polysomatic series constructed from three different modules. The pyroxeneJike regions of the manganese pyroxenoids...

... respectively) is in reasonable agreement with the ideal formula of balangeroite (2.625); this ratio in carlosturanite is 2.0 ( Belluso & Ferraris, 1991 ), and in chrysotile it is 1.5. Fig. 1. Back-scattered electron images of the balangeroite analogue (pale grey) and antigorite (dark grey) in sample...

...F ig . 2. TEM image of the cross-section of an asbestiform composite made of axially-textured carlosturanite (cst) transforming into chrysotile and then into polygonal serpentine (PS). The larger the size of the PS, the earlier they nucleated: first at triple-grain junctions, then at interfaces...

.... However, Mellini & Zussman (1986) discovered that “antigorites” of very low a -values between 16.8 and 33.7 Å were misidentifications of carlosturanite, which has the ideal formula Mg 42 Si 24 O 56 (OH) 68 (H 2 O) 2 . Therefore, these authors suggested a lower a -limit of about 33 Å ( m = 13...

...Fig. 84. ( a , b ) Tetrahedral representations of the 2 T 4 3 T 8 ribbon in carlosturanite projected ( a ) onto (001), ( b ) along the a -axis, ( c ) a ball-and-stick and ( d ) a graphical representation of the ribbon. Dashed black lines outline the geometrical and topological repeat...

... , Jerusalem . Compagnoni , R. , Ferraris , G. and Mellini , M. ( 1985 ) Carlosturanite, a new asbestiform rock-forming silicate from Val Varatia, Italy . American Mineralogist , 70 , 767 – 772 . Dornberger-Schiff , K. ( 1964 ) Grundzüge einer Theorie der OD-Strukturen aus...