Figure 2. Compositional variations of calcic-amphibole from the Toro diorite (DI), hornblende-biotite (HB) and porphyritic hornblende-biotite (pHB) granites, North central Nigeria. Cation proportions are per formula unit. Amphibole classification after Leake et al. [10]

From

Composition of Amphiboles from Toro Dioritic Complex, Northcentral Nigeria: A Potential Petrogenetic and Geothermobarometric Indicator

O. A Dada, E. C Ashano

Journal of Geosciences and Geomatics. 2013, 1(1), 41-46 doi:10.12691/jgg-1-1-7