Biotite on Anthophyllite | Czech Republic yellow fluorite 5”X3” and weighs 6

5”X3” and weighs 6

The natural fossil textures are beautifully highlighted in a polished oval cabochon

They existed during the Devonian period over 300 million years ago

This item is 6" x 5" and weighs 37

Sodalite is a rich

Biotite on Anthophyllite | Czech Republic yellow fluorite 5”X3” and weighs 6Biotite on anthophyllite refers to a common geological occurrence where dark mica (biotite) crystals grow within or around fibrous anthophyllite, an amphibole mineral, often forming attractive specimens with distinct textures like bladed crystals or nodular "balls," indicating specific metamorphic conditions (low HCl fluids). This item is 2 x 1 and weighs 1. 7 oz