2405: Olivine Gabbro, Bay of Islands Ophiolite, New Foundland Background: This o

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2405: Olivine Gabbro, Bay of Islands Ophiolite, New Foundland Background: This olivine gabbro is a cumulate rock from the lower crustal section of the Bay of Islands Ophiolite is sample contains a large amount of alteration products that are concentrated in very speci fic areas and several key igneous textures that are important in the crystallization history of the rock. Mineral l size (mm) Color/Pleo Noe Cleavage! Habit | n Size (mm Mode Habit Plagioclase Olivine Cpx Opx similar to that of diaspore (see Fig. 16.8); however the distm bution of the cations is quite different. nation with O and (Orm Diagnostic Features. Recognized chiefly by its black FIG. 16.33 Manganite. tifeld, Germany (Courtesy of the color and prismatic crystals. Hardness (4) and brown streakHarvard Mineralogical Museum, Copyright 2012, distinguish it from pyrolusite. Fellows of Harvard College. All rights reserved. Occurrence. Manganite is found associated with other formed by meteoric waters. manganese oxides in deposits n low-temperature hydrothermal veins associ-

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