hornblendite


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hornblendite

[′hȯrn·blen‚dīt]
(petrology)
A plutonic rock consisting mainly of hornblende.
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2), which forms most of the northeastern part of the mountain, and a more varied but less extensive dioritic unit that includes quartz diorite, tonalite, diorite, granodiorite, quartz monzonite, and hornblendite.
Hornblendite shows equigranular lexture and consists mainly of green coloured subhedral hornblende grains.
Within the mineralized zone hornblendites show well developed crystals of hornblende and trend in N45[degrees]E direction, which shows alteration to vermiculite.
The Union Bay prospect hosts a zoned ultramatic/mafic complex that ranges from dunite in the core on the southeastern side of the complex, to wehrlite and magnetite-bearing olivine clinopyroxenite, to hornblendite and gabbro in the margins.
Platinum has been reported from a hornblendite pipe near Mourbame, south-west of Lere.
In the study area, gabbro-norite and hornblendite are present in the form of patches within the surrounding epidote amphibolites.
Hornblendites, with cm-sized perfectly euhedral crystals of hornblende, are associated with the gabbros.
In Welega region, about 20 km NNE of Gimbi, the Bikilal apatite-magnetite-ilmenite deposit evaluated since 1984 by a joint Ethiopian-Korean team is situated in a zone of hornblendites in the northeastern part of an oval intrusion of gabbroic-anorthositic rocks covering about 110 [km.