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PYRAMIDAL CLASS (Hemimorphic-tetartoh...

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Originally appearing in Volume V07, Page 577 of the 1911 Encyclopedia Britannica.

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PYRAMIDAL CLASS (

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HEMIMORPHIC

Hemimorphic-
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TETARTOHEDRAL
tetartohedral) . Here the only

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ELEMENT (Lat. elementum)

element of symmetry is the tetrad

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AXIS (Lat. for " axle ")

axis . The pyramids of the first lhhll second {hol} and third{hkl} orders have each only four faces at one or other end of the crystal, and are

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HEMIMORPHIC

hemimorphic . All the

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SIMPLE

simple forms are thus open forms . Examples are

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WULFENITE

wulfenite (PbMoO4) and

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BARIUM (symbol Ba, atomic weight 137'37 [0=16])

barium antimonyl dextrotartrate (Ba(SbO)2(C4H40o).H20) .

End of Article: PYRAMIDAL CLASS (Hemimorphic-tetartohedral)

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PYRAMIDAL CLASS (Hemimorphic)

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PYRAMIDION (diminutive of " pyramid ")

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