05-28. Scapolite #1.
Scapolite – a strange and very busy mineral!
Hard to capture, it comes in many colors. Its structure leads to an odd and complex geometry. It will be the mineral of week #22 of this 52 weeks tour of the geometry of Nature.
The scapolite group includes crystals such as meionite, marialite, and silvialite. The name comes from the Greek skapos (shaft) because of the stumpy nature of its crystals. Colorless in its pure form, inclusions give it a bluish gray, greenish yellow, pink, violet, golden yellow color.
It belongs to the tetragonal system – three axes at right angles, two of them equal.
The best scapolites have been found in Madagascar, Myanmar, Tanzania, Tajikistan, and Peru.
This one is a combination of the crystal’s atoms, polyhedra and Van der Wall effect from a resource by Levien & Papike.