The Anjanabonoina pegmatites are famous for they large and multicolored tourmalines. Located 42 km WSW of the town Betafo in the central highland of Madagascar.
These pegmatite dikes outcrop at an elevation of about 1,400 meters on the eastern slope of Mount Ikaka and are emplaced in a complex environment characterized by paragneiss, marble and orthogneiss of the Neoproterozoic Itremo Group, of medium metamorphic grade. The subhorizontal bodies of pegmatite are strongly zoned. The metasedimentary rocks hosting the pegmatitic dikes locally show extensive contact-metasomatic phenomena. Abundant tourmalization extensively affected schist and quartzite units, with schorl-dravite replacing up to 30% of the rock volume Veins of quartz, dravite-schorl and danburite are locally present in metasedimentary rocks close to the pegmatites, and marble is transformed into skarn (De Vito et al 2006).
Locality mispelled as "Anjanabonsana" in Lacroix (1909).
For full locality listing click here. Alternatively: Click here for heirarchical list of localities in Anjanabonoina pegmatites, Mount Ikaka, Ambohimanambola Commune, Betafo District, Vakinankaratra Region (Betafo - Antsirabé region), Antananarivo Province, Madagascar
39 minerals listed.
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