Abstract
Cummingtonite occurs in the marginal rind of the Val Biandino intrusion (Orobic Alps, Como, Italy), both as the only amphibole phase in association with pyroxene, and as linked to calcian amphiboles of different types. Crystalchemical data point out the relationship of cummingtonite with the early stage of intrusion of the Val Biandino masses.
Riassunto
Viene segnalata la presenza di cummingtonite sia come unico anfibolo, associato talora a pirosseni, sia concresciuta con Ca-anfiboli in zone marginali, prevalentemente gabbrodioritiche, delle plutoniti della Val Biandino. Ľinterpretazione dei dati cristallochimici ha permesso di chiarire il significato di questo minerale in relazione alle ipotesi di messa in posto ed evoluzione delle plutoniti stesse.
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Nella seduta del 12 maggio 1990.
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Capitani, L.D., Liborio, G. & Schiavinato, G. Cummingtonite nelle plutoni ti della Val Blandino (Como). Rend. Fis. Acc. Lincei 1, 379–385 (1990). https://doi.org/10.1007/BF03001772
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DOI: https://doi.org/10.1007/BF03001772