Yorkshire Cracked Ammonite Pair - Fossil selenite also known as Mookaite Jasper

also known as Mookaite Jasper is a silicified porcellanite mineral

Chemical Composition: Ca2Al3(SiO4)(Si2O7)O(OH)

but solid- gem grade stones will yield no benefit other than being covered in gunk

I've mined a lot of stone

Tip Shapes: 4 Cylinder

Yorkshire Cracked Ammonite Pair - Fossil selenite also known as Mookaite JasperOrigin: Yorkshire, England Era: Mesozoic Geographic Age: 180 mya Description: These Ammonite pairs have been cracked open and sit in limestone cobbles. They can be slightly pyritized. The limestone is rather dull and not exciting, however, these Ammonites are in great condition and you can see all the intricate details of the shell. Ammonites are an extinct form of mollusk that thrived in the seas during the time of the dinosaurs and are related to