gbrts_001. Clinopyroxene-rich gabbro thin section in plane polarized light (ppl) from the the Stillwater Igneous Complex, Montana, Smith college Collection (SIC-14). Dark green and brown clinopyroxene and grayish white plagioclase feldspar. Located in the Ultramafic zone of the complex.

gbrts_002. Plagioclase-rich gabbro thin section in plane polarized light (ppl) from the the Stillwater Igneous Complex, Montana, Smith college Collection (SIC-13). Composed mainly of grayish white plagioclase feldspar and green clinopyroxene. Orthopyroxene and olivine are both present in small amounts. Located in the Ultramafic zone of the complex.

gbrts_003. Chromite-rich gabbro thin section in plane polarized light (ppl) from the Bushveld Igneous Complex, South Africa - Smith College, Mark Brandriss Collection (BV-108). Plagioclase feldspar makes up the majority of the sample. Augite and opaque chromite are also present.

gbrts_004. Chilled gabbro thin section in plane polarized light (ppl) from the the Stillwater Igneous Complex, Montana - Smith College Collection (SIC-2). Composed mainly of dark green to black clinopyroxene and grayish white plagioclase feldspar. Located in the Basal zone of the complex.

gbrts_005. Pegmatitic gabbro thin section in plane polarized light (ppl) from the the Stillwater Igneous Complex, Montana, Smith college Collection (SIC-8). Grayish white plagioclase feldspar and dark green clinopyroxene with a pegmatitic texture.

gbrts_006. Fluxion Gabbro, Ardnamurchan, Scotland. A gabbro with aligned plagioclase crystals, indicating appearance of flow. This thin section contains aligned plagioclase (1-5 mm crystals) with altered pyroxene, opaque minerals, and minor biotite. Image from the UK Virtual Microscope.