VESUVIANITE  , a See also:

• ROCK
• ROCK (O.Fr. rake, Sp. rota, Ital. rocca; possibly from a Lat. form rupica, from rupes, rock)
• ROCK, DANIEL (1799–187t)

rock-forming See also:

• MINERAL

mineral of complex com- position . It is a basic See also:

• CALCIUM [symbol Ca, atomic weight 40.0 (o= x6)]

calcium and See also:

• ALUMINIUM (symbol Al; atomic weight 27.0)

aluminium silicate See also:

• CON

con- aining small amounts of See also:

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

iron, See also:

• MAGNESIUM [symbol Mg, atomic weight 24.32 (0 = 16)]

magnesium, See also:

• WATER

water, See also:

• FLUORINE (symbol F, atomic weight 19)

fluorine, etc., and sometimes See also:

• BORON (symbol B, atomic weight I I)

boron; the ap- proximate See also:

• FORMULA
• FORMULA (Lat. diminutive of forma, shape, pattern, &c., especially used of rules of judicial procedure)

formula is H2Ca6(Al,Fe)aSi5O18 . It crystallizes in the tetragonal See also:

• SYSTEM

system, but often exhibits See also:

• OPTICAL

optical anomalies, and the optical sign varies from See also:

• POSITIVE (or PORTABLE) ORGAN

positive to negative . Well-devel- oped crystals are of frequent occurrence . They usually have the See also:

• FORM (Lat. forma)

form of four- or eight-sided prisms terminated by the basal planes (c) and See also:

• PYRAMID

pyramid-planes (p in fig.); the See also:

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

prism-planes are vertically striated and the basal planes smooth and See also:

• BRIGHT, JOHN (1811-188g)
• BRIGHT, SIR CHARLES TILSTON

bright . Crystals are transparent to translucent, vitreous in lustre and vary in See also:

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

colour from See also:

• BROWN
• BROWN, CHARLES BROCKDEN (1771-181o)
• BROWN, FORD MADOX (1821-1893)
• BROWN, FRANCIS (1849- )
• BROWN, GEORGE (1818-188o)
• BROWN, HENRY KIRKE (1814-1886)
• BROWN, JACOB (1775–1828)
• BROWN, JOHN (1715–1766)
• BROWN, JOHN (1722-1787)
• BROWN, JOHN (1735–1788)
• BROWN, JOHN (1784–1858)
• BROWN, JOHN (1800-1859)
• BROWN, JOHN (1810—1882)
• BROWN, JOHN GEORGE (1831— )
• BROWN, ROBERT (1773-1858)
• BROWN, SAMUEL MORISON (1817—1856)
• BROWN, SIR GEORGE (1790-1865)
• BROWN, SIR JOHN (1816-1896)
• BROWN, SIR WILLIAM, BART
• BROWN, THOMAS (1663-1704)
• BROWN, THOMAS (1778-1820)
• BROWN, THOMAS EDWARD (1830-1897)
• BROWN, WILLIAM LAURENCE (1755–1830)

brown to See also:

• GREEN, A
• GREEN, ALEXANDER HENRY (1832—1896)
• GREEN, DUFF (1791—1875)
• GREEN, JOHN RICHARD (1837—1883)
• GREEN, MATTHEW (1696-1737)
• GREEN, THOMAS HILL (1836-1882)
• GREEN, VALENTINE (1739–1813)
• GREEN, WILLIAM HENRY (.1825–1900)

green; a See also:

• SKY (M. Eng. skie, cloud; O. Eng. skua, shade; connected with an Indo-European root sku, cover, whence " scum," Lat. obscurus, dark, &c.)

sky-See also:

• BLUE (common in different forms to most European languages)

blue variety, called cyprine, owes its colour to the presence of a trace of See also:

• COPPER (symbol Cu, atomic weight 63.1, H=1, or 63.6, O = 16)

copper . The specific gravity is 3.4 and the hardness 62 . The name vesuvianite was given by A . G . See also:

• WERNER, ABRAHAM GOTTLOB (1750-1817)
• WERNER, ANTON ALEXANDER VON (1843– )
• WERNER, FRIEDRICH LUDWIG ZACHARIAS (1768–1823)

Werner in 1795, because See also:

• FINE

fine crystals of the mineral are found at See also:

• VESUVIUS (also Vesevus in ancient poets)

Vesuvius; these are brown in colour and occur in the ejected See also:

• LIMESTONE

limestone blocks of See also:

• MONTE

Monte Somma . Several other names have been applied to this See also:

• SPECIES

species, one of which, idocrase of R . J .

See also:

• HAUY, RENE JUST (1743-1822)

Hauy (1796), is now in See also:

• COMMON

common use . Vesuvianite is typically a mineral of contact-metamorphic origin, occurring most frequently in crystalline limestones at their contact with igneous rock-masses; it also occurs in See also:

• SERPENTINE

serpentine, See also:

• CHLORITE

chlorite-schist and See also:

• GNEISS

gneiss, and is usually associated with See also:

• GARNET
• GARNET, or GARNETT, HENRY (1555—1606)

garnet, See also:

• DIOPSIDE

diopside, See also:

• WOLLASTONITE

wollastonite, &c . Localities which have yielded fine crystallized specimens are the See also:

• ALA

Ala valley near See also:

• TURIN

Turin, See also:

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

Piedmont, Monte Somma (Vesuvius), Monzoni in the Fassa valley, See also:

• TIROL (or TYROL 1)

Tirol, Achmatovsk near Zlatonst in the Urals, the See also:

• RIVER

River Wilui See also:

• DISTRICT

district near See also:

• LAKE
• LAKE, GERARD LAKE, 1ST VISCOUNT (1744-1808)

Lake See also:

• BAIKAL (known to the Mongols as Dalai-nor, and to the Turkish tribes as Bai-kul)

Baikal in See also:

• SIBERIA

Siberia (" wiluite "), See also:

• CHRISTIANSAND (KRISTIANSUND)

Christiansand in See also:

• NORWAY
• NORWAY (Norge)

Norway, &c . When found in transparent crystals of a See also:

• GOOD, JOHN MASON (1764-1827)

good green or brown colour it is occasionally cut as a See also:

• GEM (Lat. gemma, a bud,—from the root gen, meaning " to produce,"—or precious stone; in the latter sense the Greek term is > d>os)
• GEM, ARTIFICIAL

gem-See also:

• STONE
• STONE (0. Eng. shin; the word is common to Teutonic languages, cf. Ger. Stein, Du. steen, Dan. and Swed. sten; the root is also seen in Gr. aria, pebble)
• STONE, CHARLES POMEROY (1824-1887)
• STONE, EDWARD JAMES (1831-1897)
• STONE, FRANK (1800-1859)
• STONE, GEORGE (1708—1764)
• STONE, LUCY [BLACKWELL] (1818-1893)
• STONE, MARCUS (184o— )
• STONE, NICHOLAS (1586-1647)

stone . A compact variety, closely resembling See also:

• JADE
• JADE, or JAHDE

jade in See also:

• APPEARANCE (from Lat. apparere, to appear)

appearance, has been used as an ornamental stone . (L . J .