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Encyclopedia Britannica



HEMIMORPHITE

This article appears in Volume V13, Page 258 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: HEG-HIG
HEMIMORPHITE , a
mineral
  consisting of hydrous zinc silicate, H2Zn2SiO5, of importance as an ore of the metal, of which it contains 54.4%. It is interesting crystallographically by reason of the
hemimorphic
  development of its orthorhombic crystals; these are prismatic in habit and are differently terminated at the two ends. In the figure, the faces at the upper end of the crystal are the basal plane k and the domes o, p, 1, m, whilst at the lower end there are only the four faces of the pyramid P. Connected with this polarity of the crystals is their pyroelectric characterwhen a crystal is subjected to changes of temperature it becomes positively electrified at one end and negatively at the opposite end. There are perfect cleavages parallel to the prism faces (d in the figure). Crystals are usually colourless, some-times yellowish or greenish, and transparent; they have vitreous lustre. The hardness is 5, and the specific gravity 3.45. The
mineral
  also occurs as stalactitic or botryoidal masses with a fibrous structure, or in a massive, cellular or granular
condition
  intermixed with calamine and clay. It is decomposed by hydrochloric acid with gelatinization; this property affords a ready means of distinguishing hemimorphite from calamine (zinc carbonate), these two minerals being, when not crystallized, very like each other in
appearance
 . The water contained in hemimorphite is expelled only at a red heat, and the mineral must therefore be considered as a basic metasilicate, (ZnOH)2SiOa.
The name hemimorphite was given by G. A. Kenngott in 1853 because of the typical
hemimorphic
  development of the crystals. The mineral had
long
  been confused with calamine (q.v.) and even now this name is often applied to it. On account of its pyroelectric properties, it was called electric calamine by J. Smithson in 1803.
Hemimorphite occurs with other ores of zinc (calamine and
blende
 ), forming veins and beds in sedimentry limestones. British localities are Matlock, Alston, Mendip Hills and Lead-hills; at Roughten Gill, Caldbeck Fells,
Cumberland
 , it occurs as mammillated incrustations of a sky-blue colour. Well-crystallized specimens have been found in the zinc mines at Altenberg near Aachen in Rhenish Prussia,
Nerchinsk
  mining
district
  in
Siberia
 , and Elkhorn in Montana. (L. J. S.)


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