.... Minerals with the former values would be classified as richterite and those with the latter as winchite. Regulatory agencies classify certain species of amphibole as asbestos when they occur in the asbestiform habit. These regulated species are riebeckite, cummingtonite-grunerite, anthophyllite...

... or hydrothermal alteration of volcanic rocks. The particular erionite “species” is based on the dominant extra-framework cation, erionite-Ca, erionite-K, or erionite Na. Irrespective of the species, erionite can display a fibrous/asbestiform morphology and has been linked with cases of malignant mesothelioma...

...Elena Belluso; Alain Baronnet; Silvana Capella ABSTRACT The natural occurrence of asbestos (NOA) in rocks and soil has been known for many years in several areas of the world, differently from the natural presence of asbestiform minerals. In Italy, the mapping of NOA is mandatory according...

...R. Mark Bailey ABSTRACT The San Francisco Bay Area is underlain by bedrock of the Franciscan Assemblage, which outcrops in numerous places. A significant portion of these outcrops consists of rock types that contain both regulated and unregulated asbestiform minerals, including ultra-mafic...

...Roberto Giustetto; Loredana Macaluso; Gloria Berlier; Yadolah Ganjkhanlou; Luca Barale Abstract An unusual occurrence of asbestiform sepiolite, filling veins in the antigorite serpentinites of the Voltri Unit exposed in a borrow pit (now reclaimed) in the Deiva forest, near Sassello, NW Italy...

...). Talc occurs as a fine-grained mass in anthophyllite fractures, between acicular anthophyllite partings, and as pseudomorphs after anthophyllite, with some occurring with an asbestiform habit. Thus, the talc alterations occur both parallel and perpendicular to the elongate anthophyllite, with the latter...

...R. Giustetto; K. Seenivasan; E. Belluso Abstract An atypical asbestiform sepiolite occurrence with exceptionally long fibres wrapped by a sheath of aliphatic hydrocarbons was found in the Gressoney Valley (Italian Western Alps) while monitoring asbestos presence in outcrops of serpentinite rocks...

...Mickey E. Gunter; M. Darby Dyar; Antonio Lanzirotti; Jonathan M. Tucker; Elly A. Speicher Abstract We obtained oriented Fe-XANES spectra on three amphibole bundles of fiber (i.e., asbestiform morphology), two single-crystal fragments (i.e., nonasbestiform morphology), and one aggregate of thousands...

...John D. Fitz Gerald; Richard A. Eggleton; John L. Keeling Abstract Asbestiform antigorite from Rowland Flat near Adelaide in South Australia is shown by scanning and transmission electron microscopy to consist of bundles of [010] fibres. Defects combine with grain boundaries to define flattened...

...J. Gutzmer; Nicolas J. Beukes Abstract Asbestiform manjiroite and todorokite occur as infill of bedding parallel extension veinlets in supergene altered braunite-kutnahorite lutite at the Smartt Mine in the Kalahari manganese field, South Africa. Geological evidence and preliminary geochronological...

...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...