See also:

• COPPERAS (Fr. couperose; Lat. cupri rosa. the flower of copper)

COPPERAS (Fr. couperose; See also:

• LAT

Lat. cupri See also:

• ROSA, CARL AUGUST NICHOLAS (1843-1889)
• ROSA, MONTE
• ROSA, SALVATOR (1615-1673)

rosa. the See also:

• FLOWER (Lat. flos, floris; Fr. fleur)
• FLOWER, SIB

flower of See also:

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

copper)  , 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 See also:

• VITRIOL

vitriol, or ferrous sulphate, FeSO4.7H2O, having a bluish-green See also:

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

colour and an astringent, inky and somewhat sweetish See also:

• TASTE (from Lat. taxare, to touch sharply; tangere, to touch)

taste . It is used in See also:

• DYEING (0. Eng. dedgian, dealt ; Mid. Eng. deyen)

dyeing and tanning, and in the manufacture of See also:

• INK (from Late Lat. encaustum, Gr. gysavorov, the purple ink used by Greek and Roman emperors, from iyKaiew, to burn in)

ink and of See also:

• NORDHAUSEN

Nordhausen sulphuric See also:

• ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid or fuming oil of vitriol (see See also:

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

IRON) . See also:

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

COPPER-GLANCE, a See also:

• MINERAL

mineral consisting of cuprous sulphide, Cu2S, and crystallizing in the orthorhombic See also:

• SYSTEM

system . It is known also as chalcocite, redruthite and vitreous copper (See also:

• GERMAN
• GERMAN, DUTCH AND SCANDINAVIAN

German, Kupferglaserz of G . See also:

• AGRICOLA (originally SCHNEIDER, then SCHNITTER), JOHANNES (1494-1566)
• AGRICOLA (the Latinized form of the name BAUER), GEORG (1490-1555)
• AGRICOLA, CHRISTOPH LUDWIG (1667-1719)
• AGRICOLA, GNAEUS JULIUS (A.D. 37-93)
• AGRICOLA, JOHANN FRIEDRICH (1720-1774)
• AGRICOLA, MARTIN (c. 1500-1556)
• AGRICOLA, RODOLPHUS (properly ROELOF HUYSMANN) (1443-1485)

Agricola, 1546) . The crystals have the See also:

• FORM (Lat. forma)

form of six-sided tables or prisms; 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 the See also:

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

prism faces (lettered o in the figure) being 6o° 25' . When twinned on the prism planes o, as is frequently the See also:

• CASE
• CASE, JOHN (d. 1600)

case, the crystals simulate hexagonal symmetry still more closely, as in the minerals arag- onite and See also:

• CHRYSOBERYL

chrysoberyl . Twinning also takes See also:

• PLACE (through Fr. from Lat. platea, street; Gr. IrAar6s, wide)

place according to two other See also:

• LAWS

laws, giving rise to interpenetrating crystals with the basal planes (s) of the two individuals inclined at angles of 69° or 87° 56' respectively . The mineral also occurs as compact masses of considerable extent . The colour is dark See also:

• LEAD
• LEAD (pronounced iced)

lead-See also:

• GREY, CHARLES GREY, 2ND EARL (1764-1845)
• GREY, HENRY GREY, 3RD EARL (1802-1894)
• GREY, LADY JANE (1537-1554)
• GREY, SIR EDWARD
• GREY, SIR GEORGE (1812–1898)

grey with a metallic lustre, but this is never very See also:

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

bright, since the material is readily altered, becoming See also:

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

black and dull on exposure to See also:

• LIGHT

light . The mineral is soft (H.=22) and sectile, and can be readily cut with a See also:

• KNIFE (0. E. cuff, a word appearing in different forms in many Teutonic languages, cf. Du. knijf, Ger. Kneif, a shoe-maker's knife, Swed. knif; the ultimate origin is unknown; Skeat finds the origin in the root of " nip," formerly " knip "; Fr. canif is a

knife, like See also:

• ARGENTITE

argentite; sp. gr . 5.7 .

Analyses agree closely with the See also:

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

formula Cu2S, which corresponds to 79.8% of copper; small quantities of iron and See also:

• SILVER

silver are some-times See also:

• PRESENT

present . Next to chalcopyrite, copper-glance is the most important ore of copper . It usually occurs in the upper See also:

• PART

part of the copper-bearing lodes, and is a secondary sulphide derived from the chalcopyrite met with at greater depths; sometimes, however, the two minerals are found together in the same part of the lodes . The best crystals are from St Just, St Ives, and See also:

• REDRUTH

Redruth in See also:

• CORNWALL

Cornwall, and from See also:

• BRISTOL
• BRISTOL, EARLS AND MARQUESSES OF
• BRISTOL, GEORGE DIGBY, 2ND EARL OF1 (1612-1677)
• BRISTOL, JOHN DIGBY, 1ST EARL OF 6 (1580-1653)

Bristol in See also:

• CONNECTICUT

Connecticut . Small crystals of See also:

• RECENT

recent formation are found on See also:

• ROMAN

Roman See also:

• BRONZE

bronze coins in the thermal springs at Bourbonne-See also:

• LES

les-Bains . Copper-glance readily alters to other minerals, such as See also:

• MALACHITE

malachite, covellite, See also:

• MELACONITE

melaconite and chalcopyrite . On the other See also:

• HAND
• HAND (a word common to Teutonic languages; cf. Ger. Hand, Goth. handus)
• HAND, FERDINAND GOTTHELF (1786-185r)

hand, it is found as pseudomorphs after chalcopyrite, See also:

• GALENA

galena, and organic structures such as See also:

• WOOD, ANTHONY A2 (1632-1695)
• WOOD, JOHN GEORGE (1827—1889)
• WOOD, MRS HENRY [ELLEN] (1814—1887)
• WOOD, SEARLES VALENTINE (1798—188o)

wood; copper-glance pseudomorphous after galena preserves the cleavage of the See also:

• ORIGINAL

original mineral and is known as harrisite . Isomorphous with copper-glance is the orthorhombic mineral stromeyerite, a See also:

• DOUBLE
• DOUBLE (from the Mid. Eng. duble, the form which gives the present pronunciation, through the Old Er. duble, from Lat. duplus, twice as much)

double copper and silver sulphide, CuAgS, which occurs in abundance in the See also:

• ALTAI (in Mongolian Altain-ula, the " Mountains of Gold ")

Altai Mountains . (L . J .