crystals on a large hematite matrix from Egremont

It is a large specimen and displays beautifully

Name: Chalcopyrite Crystal Cluster

Size:  5x4mm

found in various formations and sizes

Samarskite-(Y) Mineral | 3.4 grams | South Platte Pegmatite Mining District | Jefferson County, Colorado, USA Body Jewellery crystals on a large hematiteSamarskite is a radioactive rare earth mineral. Samarskite crystallizes in the orthorhombic dipyramidal class as black to yellowish brown stubby prisms although it is typically found as anhedral masses. Specimens with a high uranium content are typically metamict and appear coated with a yellow brown earthy rind. Samarskite (Y) is rich in rare earth elements (REEs), niobium (Nb), and tantalum (Ta)all of which are valuable in advanced electronics,