Marcasite Quartz Cluster from Russia Mica It is an important rock-forming

It is an important rock-forming mineral present in igneous

2” x 1” and weighs

These Barite Sand Concretions from Morocco

This polished specimen displays an ancient algal colony fossil from the Pennsylvanian Period (approximately 323–299 million years ago)

creating glowing yellow/orange splotches or veins

Marcasite Quartz Cluster from Russia Mica It is an important rock-formingThis beautiful cluster from Russia features shimmering marcasite and quartz. Marcasite is made of iron sulfide, with the same chemical formula as pyrite, though it forms in a different crystal structure. It typically appears metallic and pale bronze with a bright reflective luster. This item is 2. 75 x 1. 25 and weighs 1. 15 oz