21569 - Association Quartz + Pyrite + Barite Crystals - Alnif (Morocco) Neuropteris the Czech Republic (2)
Yard notes & kiln story
Description
the Czech Republic (2)
Line 0: Place of purchase: Mauritania Date: 2014 Mass (g): 693
The last feature makes a significant difference in relation to teeth of the genus Liodon Agassiz
A fine rim is observed on the sample
It has glued but not restored fracture
21569 - Association Quartz + Pyrite + Barite Crystals - Alnif (Morocco) Neuropteris the Czech Republic (2)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. The mineral pyrite, or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2 (iron(II) disulfide). Pyrite is