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Encyclopedia Britannica - Main :: DIO-DRO |
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DITRIGONAL PYRAMIDAL CLASS ( Hemimorphic
Here there are three similar planes of symmetry intersecting in the triad axis
axis
developed
Trigonal pyramid lhkk}, consisting of three faces which correspond to the three upper or the three lower
Ditrigonal pyramid {hkl}, of six faces, corresponding to the six upper or lower
Hexagonal pyramid (hkl) (where h-2k+ l=o), of six faces, corresponding to the six upper or lower faces of the hexagonal bipyramid. Trigonal prism {211} or {III}, two forms each consisting of three faces parallel to principal
Hexagonal prism 1.1011, which is geo-FIG. 73.Crystal of metrically the same as m the last class. Tourmaline. Ditrigonal prism {hkl) (where h+k+l=o), of six faces parallel to the principal
Basal pedion (III) or (TM, each consisting of a single plane perpendicular to the principal axis. Fig. 73 represents a crystal of tourmaline with the trigonal prism (2YY), hexagonal prism (IOY), and a trigonal pyramid at each end. Other substances crystallizing in, this class are pyrargyrite
proustite
zincite
sodium lithium sulphate, tolylphenylketone.End of Article: DITRIGONAL PYRAMIDAL If you wish, you can link directly to this article.
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