21576 - Museum Grade 8.27 Inch Quartz Crystals + Epidote in Matrix - Imilchil (Morocco) MakeOffer 0 cm tall) - these

0 cm tall) - these snail shells have been replaced by translucent

with high concentrations of OH−

Abbreviation: NWA 8725

Impressive rooted teeth

Enchodus oxytomus

21576 - Museum Grade 8.27 Inch Quartz Crystals + Epidote in Matrix - Imilchil (Morocco) MakeOffer 0 cm tall) - theseQuartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 siliconoxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. Well developed crystals of epidote, Ca2Al2(Fe3+; Al)(SiO4)(Si2O7)O(OH), crystallizing in the monoclinic system, are of frequent occurrence: they are