CLINOHEDRAL

This article appears in Volume V07, Page 579 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: CHR-CLI

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

plane

PLANE

. The only form which is here geometrically the same as in the holosymmetric class is the clino-pinacoid {o10}. The forms perpendicular to the

plane

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

angle

ANGLE (from the Lat. angulus, a corner, a diminutive, of which the
primitive
- PRIMITIVE
form,
angus
- ANGUS, EARLS OF
, does not occur in Latin; cognate are the Lat. angere, to compress into a
bend
- BEND
or to strangle, and the Gr. ayKOS, a
bend
- BEND
; both connected with the
Aryan
- ARYAN
root
- ROOT (late O.E. rot, adopted from Scand., cf. Norw. and Swed. rot, Dan. rod; the true O.E. word was wyrt, plant, represented in Ger. Wurz or Wurzel; the ultimate root is the same in both words, and is seen in Lat. radix)
- ROOT, ELIHU (1845– )
ank-, to

, and elbos, form), consisting of two planes equally inclined to the plane of symmetry.
Examples are potassium tetrathionate (K2S406),

hydrogen

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

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

SYSTEM

SYSTEM

(Triclinic).
In the anorthic (from av, privative, and bpOos, right) or triclinic

system

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

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