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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).

22The 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.

22I are the basal pinacoid, a {oor}, and two square pyramids, b { 'or } and c { 2011.

222 is a tabular crystal in which the basal pinacoid (o) predominates.

22I are the basal pinacoid, a {oor}, and two square pyramids, b { 'or } and c { 2011.

22I) 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.

00anatase crystal 0.8 mm long with well developed steep straited pyramid faces terminated by the pinacoid (001 ).

00I) 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 78Ã‚° 23', whilst that between c and m is go.

002 and 3 are bounded by the domes d and f and the basal pinacoid c; fig.

00r 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).

00The 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.

002 is a tabular crystal in which the basal pinacoid (o) predominates.

002 and 3 are bounded by the domes d and f and the basal pinacoid c; fig.

02

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