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Title is exactly "Gabbro"
Leucocratic, orthorhombic pryoxenes abundant
Rock has been subjected to alteration and shear forces, the garnet present is probably an alteration product
Rock appears to be hydrothermally altered, sample is taken from a sill and is source of basaltic tuffs in area
Amphibole, epidote, chlorite, quartz, calcite, and clinozosite present are thought to be alteration products
Rock may have undergone some alteration
Fedlspar is cream-pink colored and much has been altered to sericite/epidote
contains clots of black spheroids
Gabbro with hydrothermal "oceanic" processes and prehnite-pumpellyite metamorphic overprint.
Plagioclase, clinopyroxene, olivine, ilmenite. metamorphic paragenesis: albite, sericite, chlorite, hematite, sphene, carbonates. Well-preserved relics of…
Dark gabbro dike separating ijolite and uncompahgrite
Coarse gabbro, extracted from the southern dike of two east-west dikes N of Deldardo Creek.
Evenly distributed dark, light, and white colored coarse-grained (1 mm) crystals. Obvious traces of oxidation from some metallic mineral…