Hornblende Gabbro Hand Sample Photos. Click on any photo for a larger image. Some of the larger images may be on other web sites and will open in a new window.

Hornblende Gabbro Hand Sample

hgbrhs_001. Hornblende Gabbro from Salem, Essex County, Massachusetts. This sample is composed mainly of calcic plagioclase feldspar (labradorite), brown hornblende, biotite, and small amounts of clinopyroxene. Geologic Age is Early Paleozoic.