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Lakeview Mountain Tonalite
Field Collector: Esper Signius Larsen Jr.
Place Collected:Near Perris, CA Elisnore Quadrangle, Southern California
Object number: ROC21696
DescriptionPlutonic, medium-grained (1-5 mm) igneous rock that is roughly equal parts black and white on a fresh surface. Consists of 40% white plagioclase feldspar (~4 mm), 25% black honblende prisms (~5 mm), 20% black biotite laths (4-5 mm), 10% light grey quartz (2-3 mm), and 5% K-feldspar.
In Collection(s)