Haydenite is the name given to small yellowish crystals, twinned on a rhombohedronplane r, from Jones's Falls near Baltimore in Maryland.
Crystals are usually rhombohedral in habit, and the primitive rhombohedron r {100} is a common form, the faces being often curved as represented in the figure.
The crystals are rhombohedral, and the predominating form is often a rhombohedron (r) with interfacial angles of 85 deg.
Rhomobohedral axes are taken parallel to the three sets of edges of a rhombohedron (fig.
In calcite, for instance, the figure has roughly the shape of a rounded rhombohedron with depressed faces and is symmetrical about three vertical planes.
Trigonal pyramid {hkk}, consisting of the three faces which correspond to the three upper or the three lower faces of a rhombohedron of the holosymmetric class.
If a knife blade be pressed into the edge of a cleavage rhombohedron of calcite (at b, fig.
A specially characteristic feature is that this rhombohedron is frequently the only form present on the crystals (in calcite it is rare except in combination with other forms); the faces are also usually curved (fig.
The crystals have the form of a hexagonal prism m terminated by a rhombohedron r, the alternate edges between these being sometimes replaced by the faces of a rhombohedron s.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "rhombohedron" in a variety of sentences. We hope that you will now be able to make sentences using this word.
