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Publications :
Impressive and rare authentic example of Spinosaurus caudal (tail) vertebra bones
The villagers continue to find pieces
with high concentrations of OH−
Under binocular loupes you can even see the small details
21576 - Museum Grade 8.27 Inch Quartz Crystals + Epidote in Matrix - Imilchil (Morocco) MakeOffer Publications :Quartz 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
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