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AUGITE

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Originally appearing in Volume V02, Page 902 of the 1911 Encyclopedia Britannica.

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AUGITE , an important member of the See also:

PYROXENE

pyroxene (q.v.) See also:

GROUP

group of See also:

rock-forming minerals. The name (from ai )al, lustre) has at various times been used in different senses; it is now applied to aluminous pyroxenes of the See also:

MONOCLINIC

monoclinic See also:

SERIES (a Latin word from serere, to join)

series which are dark-greenish, brownish or See also:

black in See also:

COLOUR (Lat. color, connected with celare, to hide, the root meaning, therefore, being that of a covering)

colour. Like the other pyroxenes it is characterized crystallographically by its distinct cleavages parallel to the See also:

PRISM (Gr. rrpivµa, properly a thing sawn, Irpii"ety, to saw)

prism-faces (M), the 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 between which is 87°. A typical crystal is represented in fig. 1, whilst fig. 2 shows a crystal twinned on - the orthopinacoid (r'). Such crystals, of See also:

SHORT, FRANCIS JOB (1857– )

short prismatic See also:

HABIT (through the French from Lat. habitus, from habere, to have, hold, or, in a reflective sense, to be in a certain condition; in many of the English senses the French use habitude, not habit)

habit and black in colour, are See also:

COMMON

common as phenocrysts in many basalts, and are hence known as " basaltic augite ": when the containing rock weathers to a clayey material the augite is See also:

LEFT

left as black FIG. I. FIG. 2. isolated crystals, and such specimens, usually from Bohemia, are represented in all See also:

MINERAL

mineral collections. Though typical of basaltic rocks, augite is also an important constituent of many other kinds of igneous rocks, and a rock composed almost wholly of augite is known as augitite. It also occurs in metamorphic rocks; for example, in the crystalline limestones of the Fassathal in See also:

TIROL (or TYROL 1)

Tirol, where the variety known as fassaite is found as pistachio-See also:

green crystals resembling See also:

EPIDOTE

epidote in See also:

APPEARANCE (from Lat. apparere, to appear)

appearance.

Chemically, augite resembles See also:

DIOPSIDE

diopside in consisting mainly of CaMg5i2O6, but it contains in addition alumina and ferric See also:

IRON [symbol Fe, atomic weight 55.85 (0=16)]

iron as (Mg, Fe") (Al, Fe"')2 SiO6; the acmite (NaFe"'Si2O6) and jadeite (NaAlSi2O6) molecules are also sometimes See also:

PRESENT

present. See also:

Variations in the amount of iron in mixtures of these isomorphous molecules are accompanied by variations in the See also:

OPTICAL

optical characters of the augite. (L. J.

End of Article: AUGITE

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