A close up view of Granite showing black biotite grains, pinkish and
white grains of feldspar and gray grains of quartz.
Gabbro
A Pegmatite is a coarse grained igneous rock. This is a granitic
pegmatite in that the minerals comprising the rocks are quartz and
feldspar, the two main ingredients of granite. The large black crystals
are tourmaline.
Peridotite is composed of the mineral Olivine.
This specimen is from AZ.
This is a nodule of Peridotite in basalt.
