08-20

08-20. Quartz #1.

– Maban in Australian Aboriginal mythology – Quartz is going to be the mineral of week #34. Regardless of its size or shape, its long prism faces always join at a perfect 60° angle. The Ancient Greeks called it kruos, “icy cold” because they believed the mineral to be a form of super cold ice.

Quartz belongs to the trigonal crystal system – triangular in cross section, and its symmetry is P31/21 or P32/21. The largest documented single crystal of quartz was found near the town of Itapore, Brazil. It measured approximately 6.1×1.5×1.5 meters and weighed more than 44 tonnes.

From a resource by R. Wyckoff.

08-20

 

08-18

08-18. Cobaltite #6.

I found the mischief maker in the cobaltite crystal!

This little yellow green atom, half sulfur, half arsenic is starting to affect the cobalt atom next to it and breaking what would be otherwise a very solid symmetry.

From a resource by Giese and Kerr.

08-18

08-17

08-17. Cobaltite #5.

The binding pattern between the cobaltite atoms makes for a nice tiling background.

I brought in the whole structure in the foreground to show what it looks like from a 3D perspective

From a resource by Giese and Kerr

08-17