Some minerals of the enargite group, the optical features of which suggest them to be luzonite or famatinite (which cannot be told apart optically), were studied by electron probe microanalysis. Two separate and closely associated terms of the luzonite-famatinite series were evidenced, containing in mean 6,49% of Sb and 13,86% of As (luzonite) and 17,25% of Sb and 4,10% of As (famatinite) respectively. The association of the two terms would prove that between these two minerals there is no complete miscibility in their whole field of stability.
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Con il contributo del Ministero per i Beni e le Attività Culturali