## pinacoid

Origin

Ancient Greek *πινάκιον* (pinakion, “slab, tablet”) + *-oid*.

- I) bounded by the two faces of the basal
**pinacoid**(c) and the four faces of the prism (m); the angle between the prism-faces (mm) is 78° 23', whilst that between c and m is go. - 2 and 3 are bounded by the domes d and f and the basal
**pinacoid**c; fig. - R is bounded by the basal
**pinacoid**c (ooi) parallel to which is the perfect cleavage, the clinopinacoid b ((D10) parallel to the plane of symmetry, and the pyramids m (221) and o (112). - The Helena crystals are of tabular habit, being composed of the basal
**pinacoid**with a very short hexagonal prism, whilst at Yogo Gulch many of the crystals affect a rhombohedral habit. - I are the basal
**pinacoid**, a {oor}, and two square pyramids, b { 'or } and c { 2011.

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