Alkaline Rocks and Carbonatites of the World

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Carpacayma

stripes

Occurrence number: 
022-00-004
Country: 
Bolivia
Region: 
Cochabamba
Location: 
Longitude: -66, Latitude: -17.83

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
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith