21571 - Association Quartz + Galena + Pyrite + Barite Crystals - Alnif (Morocco) Calamopleurus • Triassic of China (6)

• Triassic of China (6)

including the dehydration of clay-rich

Comparisons are being made with similar remains published by Yoshitaka Yabumoto and Teruya Uyeno

The process that created the septaria that characterize septarian concretions remains unclear

21571 - Association Quartz + Galena + Pyrite + Barite Crystals - Alnif (Morocco) Calamopleurus • Triassic of China (6)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