08-22

08-22. Quartz #3.

How can we not be seduced by mineralogy? I am!

Apparently, it all started like that thousand & thousand years ago. Little dots getting together as one structure to grow as a tall translucent crystal. Quartz is a crystal of many hidden beauties…

08-22

08-21. Quartz #2.

Just like cool ice in the middle of a hot summer day, the Quartz geometry has a soothing and refreshing feel. So does the elegant symmetry of its atoms in their unit cell.

From a resource by Hazen, Finger, Hemley and Mao.

08-21

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

 

04-09

04-09. Silver #1.

From the mines of Potosi to the cathedrals of Spain – silver! Silver was a rare and precious material throughout the middle ages. It is also a mineral and the crystal of week #15 of this 52-weeks exploration of the geometry of Nature.

Silver is an element. It is also a crystal that belongs to the isometric-hexoctahedral system family – crystals that are made of 48 equal triangular faces.

All black and white, a very “minimalist” and regular symmetry, an interesting moiré pattern coming from the visualization of the Van der Waals force that defines the attraction field between molecules – Silver will be an unusual mineral to visually explore for a week.

This first image is coming from a resource by R. Wyckoff: structure of a silver crystal.

04-09