Chiolite

Image

An excellent, lustrous, translucent and blocky specimen of the rare mineral chiolite from Greenland. Chiolite is related to cryolite, but is much rarer and only occurs as massive material. This is a valuable piece of gem rough weighing 28 grams. 3.6 x 2.1

© Photo by Rob Lavinsky, iRocks.com – CC-BY-SA-3.0

Properties

Formula Na5Al3F14
Abbreviation Cio
Luminescence emitters Triplet-singlet, Unspecified
IMA Status Grandfathered (pre-IMA), 1846
Search other databases webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Crystal symmetry Tetragonal, Point group 4/mmm, Space group P4/mnc (#128)
Tags Mineral, Halide

Composition

Element Atoms
Al 3
Na 5
F 14
Total: 22

References

Reference
Lines Spectra Images
Moenke 1974 4 0 0
Tarashchan 1978 1 0 0