Marcasite Quartz Cluster from Russia Mica from the early Cambrian to

from the early Cambrian to the end of the Permian period

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

It is an important rock-forming mineral present in igneous

These Barite Sand Concretions from Morocco

Marcasite Quartz Cluster from Russia Mica from the early Cambrian toThis 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