CHRYSOCOLLA  , a hydrous See also:

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

copper silicate occurring as a decomposition product of copper ores . It is never found as crystals, but always as encrusting and botryoidal masses with 'a microcrystalline structure . It is 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 or bluish-green in See also:

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

colour, and often has the See also:

• APPEARANCE (from Lat. apparere, to appear)

appearance of See also:

• OPAL

opal or See also:

• ENAMEL (formerly " amel," derived through the Fr. amail, emmll, esmail, from a Latin word smaltum, first found in a 9th-century life of Leo IV.)

enamel, being translucent and having a conchoidal fracture with vitreous lustre; some-times it is earthy in texture . Not being a definite crystallized substance; it varies widely in chemical See also:

• COMPOSITION
• COMPOSITION (Lat. compositio, from componere, to put together)

composition, the copper See also:

• OXIDE

oxide (CuO), for example, varying in different analyses from 17 to 67%; the See also:

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

formula is usually given as CuSiO3+2H2O . The hardness (2–4) and specific gravity (2.0–2.8) are also variable . It has recently been suggested that the material may really be a mixture of more than one hydrous copper silicate, since See also:

• DIFFERENCES, CALCULUS OF (Theory of Finite Differences)

differences in the microcrystalline structure of the different concentric layers of which the masses are built up may be detected . Various impurities (See also:

• SILICA

silica, &c.) are also commonly See also:

• PRESENT

present, and several varieties have been distinguished by See also:

• SPECIAL

special names: thus dillenburgite, from Dillenburg in See also:

• NASSAU

Nassau, contains copper carbonate; demidoffite and cyanochalcite contain copper phosphate; and pilarite contains alumina (perhaps as See also:

• ALLOPHANE

allophane) . The See also:

• MINERAL

mineral occurs in the upper parts of See also:

• VEINS

veins of copper ores,and has resulted from their alteration by the See also:

• ACTION

action of See also:

• WATERS, TERRITORIAL

waters containing silica in See also:

• SOLUTION (from Lat. solvere, to loosen, dissolve)

solution . Pseudomorphs of chrysocolla after various copper minerals (e.g. See also:

• CUPRITE

cuprite) are not uncommon . It is found in most copper mines . The name chrysocolla (from xpveor, See also:

• GOLD
• GOLD [symbol Au, atomic weight 195.7(H = 1),197.2(0 =16)]

gold, and xoXXa, See also:

• GLUE (from the O. Fr. glu, bird-lime, from the Late Lat. gluten, glus, glue)

glue) was applied by See also:

• THEOPHRASTUS

Theophrastus and other See also:

• ANCIENT
• ANCIENT (also spelt ANTIENT; derived, through the Fr. ancien, old, from the late Lat. antianum, from ante, before)

ancient writers to materials used in soldering gold, one of which, from the See also:

• ISLAND (O.E. ieg =isle, +land')

island of See also:

• CYPRUS
• CYPRUS, CHURCH OF

Cyprus, may have been identical with the mineral now known by this name . See also:

• BORAX (sodium pyroborate or sodium biborate)

Borax, which is used for this purpose, has also been called chrysocolla .

A mineral known as pitchy copper-ore (Ger . Kupferpecherz), and of some importance as an ore of copper, is usually classed as a variety of chrysocolla containing much admixed See also:

• LIMONITE, or BROWN IRON ORE

limonite . It is dark 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:

• BLACK
• BLACK, ADAM (1784-1874)
• BLACK, JEREMIAH SULLIVAN (1810–1883)
• BLACK, WILLIAM (1841-1898)

black in colour, with a dull to glassy or resinous lustre, and resembles See also:

• PITCH
• PITCH, MUSICAL

pitch in appearance . In thin sections it is translucent and optically isotropic, and See also:

• RECENT

recent See also:

• EXAMINATIONS

examinations seem to prove that it is a homogeneous mineral and not a See also:

• MECHANICAL

mechanical mixture of chrysocolla and limonite . (L . J .