1) Hexagonal mineral
Found on
https://www.crosswordclues.com/clue/cliftonite
Cliftonite is a natural form of graphite that occurs as small octahedral inclusions in iron-containing meteorites, such as Campo del Cielo. It typically accompanies kamacite, and more rarely schreibersite, cohenite or plessite. Cliftonite was first considered to be a new form of carbon, then a pseudomorph of graphite after diamond, and finally re-...
Found on
http://en.wikipedia.org/wiki/Cliftonite
(from the article `graphite`) ...and marble and also in granites, pegmatites, and carbonaceous clay slates. Small isometric crystals of graphitic carbon (possibly pseudomorphs ...
Found on
http://www.britannica.com/eb/a-z/c/97
No exact match found.
