, mica, haematite, and zircon are typical accessory minerals.
44.19 47.96 * DO-1-1: fresh trachyandesite, DO-1-2: zeolitized trachyandesite, DO-2: trachyandesite ("hauyne
tephrite") and DO-3 nepheline tephrite (Hibsch 1915), all from the Dobranka locality, DO-4: zeolitized tephrite, Ovesna.
The sodalite family is composed of the minerals sodalite, nosean, hauyne
and lazurite; cubic aluminosilicate species with the formula [(Na,Ca).sub.4-8] [Al.sub.6][Si.sub.6][O.sub.24][([SO.sub.4],Cl,OH,S).sub.1-2] n[H.sub.2]O.
Three of the four members of the sodalite group - sodalite, hauyne
and lazurite - are known to occur at Monte Somma/Vesuvius, while unconfirmed tests suggest that the fourth member, nosean, is also present.
Typical associated minerals include a sodalite-group mineral (sodalite, lazurite, hauyne
or nosean), nepheline, diopside, sanidine, pargasite, phlogopite-biotite and calcite.