stripes
Occurrence number:
022-00-004
Country:
Bolivia
Region:
Cochabamba
Location:
Longitude: -66, Latitude: -17.83
Carbonatite:
No
A phonolite flow occurring north-northeast of San Pedro is intercalated in Carboniferous calcareous sediments. The rock comprises phenocrysts of sanidine, nepheline and a few of aegirine-augite and amphibole in a groundmass of feldspar and nepheline, partly replaced by an isotropic mineral (?sodalite).
References:
SMULIKOWSKI, K and KOZLOWSKI, R. 1934. Les roches eruptives des Andes de Bolivie (etude micrographique). Archiwum Mineralogiczne Towarzystwa Naukowego Warszawskiego, 10, 122-234
Location: