h x w x d (mm):
33 x 21 x 31
Weight (carat):
68
Description:
Mostly tabular, with some multiterminated crystals, with acicular elements on and within tabular crystals, as well as dense acicular indigo-grey structures (vibrous). Associated with plenty of mica and a number of small red tourmaline crystals, with small amounts of cleavelandite.
Associations:
cleavelandite, mica
Crystallization & Habit:
hexagonal, tabular, pinacoid, multi-terminated, acicular
Locality:
Deo Darrah
Kuran Wa Mujan District
Badakhshan, Afghanistan.
Kuran Wa Mujan District
Badakhshan, Afghanistan.
Terminology
Hexagonal: Having six sides.
Tabular: Said of a feature having two dimensions that are much larger or longer than the third.
Pinacoid: A pinacoid is composed of only two parallel faces.
Acicular: Acicular, in mineralogy, refers to a crystal habit composed of slender, needle-like crystals.
Multi-terminated: Multi-termination refers to a habit in which a columnar hexagonal crystal is terminated by multiple needle-like elements, which are often serrated. This is neither an <i>official</i> term, nor is the Vorobyevite Museum hung up on it, but you have to call it something.
