Pyritized Crinoid Crown - Fossil Specimen light brown which is a variety of

which is a variety of microcrystalline quartz

where silica gels solidified within gas bubbles or seams of rhyolite and tuff

Its swirling layers of light and dark green make each piece unique

Grit : 50/150

I've mined a lot of stone

Pyritized Crinoid Crown - Fossil Specimen light brown which is a variety ofMined from: Silica Shale, Sylvania area, Lucas County, Ohio, U. S. A Era: Paleozoic Geological Age: Middle Devonian, Givetian, approximately 387. 9382. 3 mya Description: This one of a kind pyrite crinoid crown fossil specimen is a large gray matrix plate preserving multiple crown sections with long, curved arms spread across the surface. The fossilized crowns stand out clearly against the lighter stone, with dark pyritized arm segments and raised cup