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CLINOHEDRAL

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Originally appearing in Volume V07, Page 579 of the 1911 Encyclopedia Britannica.

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CLINOHEDRAL CLASS (Hemihedral; Domatic). Crystals of this class are symmetrical only with respect to a single See also:

PLANE

plane. The only See also:

FORM (Lat. forma)

form which is here geometrically the same as in the See also:

HOLOSYMMETRIC

holosymmetric class is the clino-pinacoid {o10}. The forms perpendicular to the plane of symmetry are all pedions, consisting of single planes with the indices (100), (Too), (o01), (ooi), (hol), &c. The remaining forms, {hko} ,(okl) and (hkl), are domes or " gonioids " (yc,via, an See also:

ANGLE (from the Lat. angulus, a corner, a diminutive, of which the primitive form, angus, does not occur in Latin; cognate are the Lat. angere, to compress into a bend or to strangle, and the Gr. ayKOS, a bend; both connected with the Aryan root ank-, to

angle, and elbos, form), consisting of two planes equally inclined to the plane of symmetry. Examples are See also:

POTASSIUM [symbol K (from kalium), atomic weight 39.114 0=16)]

potassium tetrathionate (K2S406), See also:

HYDROGEN [symbol H, atomic weight x-oo8 (0=16)]

hydrogen trisodium hypophosphate (HNaaP208.9H2O); and amongst minerals, clinohedrite (H2ZnCaSiO4) and scolectite. 5. ANORTHIC See also:

SYSTEM

SYSTEM (Triclinic). In the anorthic (from av, privative, and bpOos, right) or triclinic system none of the three crystallographic axes are at right angles, and they are all of unequal lengths. In addition to the parameters a : b : c, it is necessary to know the angles, a, ft, and y, between the axes. In See also:

ANORTHITE

anorthite, for example, these elements are a : b : c= 0.6347 : I :0.5501; a=93° 13', 19=115° 55', 7=91° 12'.

End of Article: CLINOHEDRAL

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