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Gabbro typically appears black or dark green due to its high content of dark-colored minerals like pyroxene and amphibole. Sometimes, it may also display lighter shades of gray depending on the specific mineral composition.
Olivine does not contain Gabbro. Gabbro can contain olivine. Usually no more than a few percent.
Yes
No, gabbro does not typically contain mineral quartz. Gabbro is a coarse-grained igneous rock composed primarily of calcium-rich plagioclase feldspar and pyroxene minerals. Quartz is not a common mineral in gabbro; it is more common in granitic rocks.
The fine-grained equivalent of gabbro is basalt. Basalt is an igneous rock that forms from the rapid cooling of lava on the Earth's surface, resulting in smaller mineral crystals compared to gabbro.
If you crushed gabbro, you would obtain clasts primarily composed of minerals such as pyroxene, plagioclase feldspar, and olivine. These minerals are common in gabbro, which is a coarse-grained igneous rock primarily made up of these mineral components.