Rhyolite Rock
Rhyolites are extrusive igneous rocks with very high silica content. It’s usually gray or pink, with tiny grains that are difficult to observe without magnification or a 10x-powered loop. Rhyolite is composed of Plagioclase, Quartz, and Sandine, with minor amounts of Biotite and Hornblende. If you’ve dug for rocks and minerals then you’ve come across […]
Galena Mineral
Galena is relatively easy to identify because of its distinct silver color (metallic luster) and crystal structure. Freshly broken pieces will exhibit a perfect cleavage in three directions intersecting at 90 degrees. If you have a specimen then you’ll need to understand that it will tarnish over time to a dull gray. Whatever you do, […]