Caracterización mineralógica de la tremolita asbestiforme de Valverde del Camino (Huelva)
- Juan Carlos Fernández Caliani
- Emilio Galán Huertos
ISSN: 0210-6558
Year of publication: 1991
Volume: 14
Issue: 0
Pages: 125-133
Type: Article
More publications in: Boletín de la Sociedad Española de Mineralogía
Abstract
Tremolite-filled veinlets occur within a deeply tectonized, serpentinized and amphibolized peridotite body which intrudes Devonian slates of the Valverde del Camino anticlinorium, in the South-Iberian Pyrite Belt. Veins can be up to 10 cm thick. Tremolite fibres are as long as 4 cm, with thicknesses between 0.1 mm (asbestiform variety) and 1 cm. The more fibrous aggregates are white and are oriented either at right angles to the wall rocks (cross-fibre) or subparallel to the trend of the vein (slip-fibre). The tremolite mineralization is very pure with only chlorite and serpentine. Tremolite is poor in calcium, although the asbestiform variety is richer in this element. The fibrous varieties are similar to serpentine asbestos of short-medium type, but their scarcity precludes economic recovery.