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HEMIMORPHIC

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

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HEMIMORPHIC CLASS (Sphenoidal). In this class the only See also:

ELEMENT (Lat. elementum)

element of symmetry is a single dyad See also:

AXIS (Lat. for " axle ")

axis, which is polar in See also:

CHARACTER (Gr. xapareri7p, from xap&crew, to scratch)

character, being dissimilar at the two ends. The See also:

FORM (Lat. forma)

form (0101 perpendicular to the axis of symmetry consists of a single See also:

PLANE

plane or pedion; the parallel See also:

FACE (from Lat. fades, derived either from facere, to make, or from a root fa-, meaning " appear "; cf. Gr. cbatvstv)

face is dissimilar in character and belongs to the pedion {oio1. The pinacoids 1100), See also:

TOOL (0. Eng. tdl, generally referred to a root seen in the Goth. taujan, to make, or in the English word " taw," to work or dress leather)

tool}, {hol} and (hol} parallel to the axis of symmetry are geometrically the From µ6VOt, single, and KXLVSLP, to incline, since one axis is inclined to the plane of the other two axes, which are at right angles.same in this class as in the See also:

HOLOSYMMETRIC

holosymmetric class. The remaining forms consist each of only two planes on the same See also:

side of the axial plane XOZ and equally_ inclined to the dyad axis (e.g. in fig. 62 the two planes X YZ and X YZ) ; such a See also:

WEDGE (O. Eng. wecg, a mass of metal, cognate with Dutch wig, wigge, Dan. vaegge, &c.; in Lith. the cognate form outside Teut. is found in wagis, a peg, spigot; there is no connexion with " weigh," " weight," which must be referred to the root wegh, to li

wedge-shaped form is some-times called a sphenoid. Fig. 64 shows two crystals of tartaric See also:

ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid, a a right-handed crystal of dextro-tartaric acid, and b a See also:

LEFT

left-handed crystal of laevotartaric acid. The two crystals are enantiomorphous, i.e. although they have the same interfacial angles they are not superposable, one being the See also:

MIRROR (through O. Fr. mirour, mod. miroir, from a sup-posed Late Lat. miratorium, from mirari, to admire)

mirror See also:

IMAGE (Lat. imago, perhaps from the same root as imitari, copy, imitate)

image of the other. Other examples are See also:

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

potassium dextro-tartrate, See also:

CANE

cane-See also:

SUGAR

sugar, See also:

MILK (0. Eng. meoluc; from a common Indo-European root, cf. Lat. mulgere, Gr. ?t dXyetv)

milk-sugar, quercite, See also:

LITHIUM [symbol Li, atomic weight 7•oo (0=16)]

lithium sulphate (Li2SO4•H20); amongst minerals the only example is the See also:

HYDROCARBON

hydrocarbon fichtelite (CbH8).

End of Article: HEMIMORPHIC

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