Biotite on Anthophyllite | Czech Republic minerals 55 oz and is 3

55 oz and is 3

Formed over millions of years as ancient coral gradually transformed into agate

While gem-quality ruby represents the transparent form of this mineral

Merycoidodon Culbertsoni "Oreodont" Fossilized Teeth

almost coral-like textures

Biotite on Anthophyllite | Czech Republic minerals 55 oz and is 3Biotite 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. 5 x 1. 5 and weighs 4. 55 oz