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present replacing magnesium, and when this pre-dominates there is a passage to hedenbergite, CaFe(SiO3)2, a closely allied variety of monoclinic pyroxene. These are distinguished from See also:

AUGITE

augite by containing little or no See also:

ALUMINIUM (symbol Al; atomic weight 27.0)

aluminium. Diopside is colourless, See also:

white, See also:

PALE (through Fr. pal, from Lat. palms, a stake, for paglus, from the stem pag- of pangere, to fix; " pole " is from the same original source)

pale See also:

green to dark green or nearly See also:

black in See also:

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

colour, the See also:

DEPTH

depth of the colour depending on the amount of iron present. The specific gravity and See also:

OPTICAL

optical constants also vary with the chemical See also:

composition; the sp. gr. of diopside is 3.2, increasing to 3.6 in hedenbergite, and 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 of optical extinction in the See also:

PLANE

plane of symmetry varies between 38° and 47° in the two extremes of the See also:

SERIES (a Latin word from serere, to join)

series, Crystals are usually prismatic in 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 with a rectangular See also:

CROSS

cross-See also:

section as shown in the figure: the angle between the See also:

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

prism faces m, parallel to which there are perfect cleavages, is 92° 50'. Several varieties, depending on See also:

DIFFERENCES, CALCULUS OF (Theory of Finite Differences)

differences in structure and chemical composition, have been distinguished, viz. coccolite (from KoKKOS, a See also:

GRAIN (derived through the French from Lat. granum, seed, from an Aryan root meaning " to wear down," which also appears in the common Teutonic word " corn ")

grain), a granular variety; salite or sahlite, from See also:

SALA, GEORGE AUGUSTUS HENRY (1828-1895)

Sala in See also:

Sweden; malacolite; See also:

DIALLAGE

diallage; violane, a lamellar variety of a dark See also:

VIOLET

violet-See also:

BLUE (common in different forms to most European languages)

blue colour; chrome-diopside, a See also:

bright green variety containing a small amount of See also:

CHROMIUM (symbol Cr. atomic weight 52.1)

chromium; and many others. Belonging to the same series with diopside and hedenbergite is a See also:

MANGANESE (symbol Mn; atomic weight, 54.93 (0=16)], a metallic chemical element. Its dioxide (pyrolusite)

manganese pyroxene, known as schefierite, which has the composition (Ca, Mg) (Fe, Mn) (SiO3)2. Diopside is the characteristic pyroxene of metamorphic rocks, occurring especially in crystalline limestones, and often in association with See also:

garnet and See also:

EPIDOTE

epidote. It is also an essential constituent of some pyroxene-granites, diorites and a few other igneous rocks, but the characteristic pyroxene of this class of rocks is augite. See also:

FINE

Fine transparent crystals of a pale green colour occur, with crystals of yellowish-red garnet (hessonite) and See also:

CHLORITE

chlorite, in See also:

VEINS

veins traversing See also:

SERPENTINE

serpentine in the See also:

Ala valley near See also:

TURIN

Turin in See also:

PIEDMONT (Ital. Piemonte; Low Lat. Pedemons and Pedemontium)

Piedmont: a crystal of this variety (" alalite ") is represented in the accompanying figure. These, as well as the See also:

long, transparent, See also:

BOTTLE (Fr. bouteille, from a diminutive of the Lat. butta, a flask; cf. Eng. " butt ")

bottle-green crystals from the Zillerthal in the Tyrol, have occasionally been cut as See also:

gem-stones.

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