The presence of the long parallel white needles, identified as diaspore and boehmite, is correlated to the polysynthetic twin planes oriented in rhombohedral
Three commercial grades of calcite and aragonite crystalline polymorph PCC exhibiting rhombohedral
, orthorhombic, and scalenohedral habits were used as pigments in various combinations with rhombohedral
habit calcite GCC.
coarse sand, stipple speckled and pseudohexagonal, occasionally gypsum- rhombohedral
and striated lenticular, in clusters and lenses, 10%; quartz and mica flakes, v.
crystallites are sufficient to fill the whole 1.
Dedolomitization and the development of rhombohedral
pores in limestones.
Epidermal cells rectangular or rhombohedral
, papillose; adaxial and
The grain structure of the South African chromite has a rhombohedral
grain shape, which is formed when the mineral is crushed during the mining operation.
At temperature 18 [degrees]C oxide NiO has rhombohedral
lattice (a = 0.
Precipitated calcium carbonate (PCC) has seen a trend away from rhombohedral
(a spherical pigment) to aragonite PCC (an acicular pigment).
Recently, we described: (1) a binary singularity involving a monoclinic and a rhombohedral
lattice in a subcell-supercell relationship and (2) a second type of singularity--a ternary singularity--in which two of the three lattices are in a derivative composite relationship.
Tabular crystals of common and complex rhombohedral
twinnings, typically about 2 mm thick, form crystalline crusts on the walls of amygdales.
1983; Peacock 1991; Peacock and Sanderson 1995; McClay and Dooley 1995) have proposed two models to explain the formation and evolution of large, transtensional basins along strike-slip faults: one model of transtensional and rhombohedral
pull-apart basins at step-overs or releasing bends, and a second model of more elongate and rift-like basins produced by fault-normal extension coeval with strike-slip motion (Ben-Avraham and Zoback 1992).