MELACONITE  , a See also:

• MINERAL

mineral consisting of cupric See also:

• OXIDE

oxide, CuO, and known also as See also:

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

black See also:

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

copper ore . In See also:

• APPEARANCE (from Lat. apparere, to appear)

appearance it is strikingly different from See also:

• CUPRITE

cuprite (q.v.) or red copper ore, which is cuprous oxide . Crystals are rare; they belong to the mono-clinic, or possibly to the anorthic See also:

• SYSTEM

system, and have the See also:

• FORM (Lat. forma)

form of thin triangular or hexagonal scales with a See also:

• STEEL, FLORA ANNIE (1847– )

steel-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 See also:

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

colour and brilliant metallic lustre . More often the mineral is massive, earthy or pulverulent, and has a dull See also:

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

iron-black colour . Hence the name melaconite, from the See also:

• GREEK
• GREEK, ETRUSCAN AND

Greek µEras, black and rthvis, dust, which was originally given by F . S . See also:

• BEUDANT, FRANCOIS SULPICE (1787—1850)

Beudant in 1832 in the form melaconise . The crystallized Vesuvian mineral was later named tenorite, a name commonly adopted for the See also:

• SPECIES

species . The hardness of the crystals is 3-4, but the earthy and powdery forms readily See also:

• SOIL

soil the fingers; the spec. See also:

• GRAY
• GRAY (or GREY), WALTER DE (d. 1255)
• GRAY, ASA (1810-1888)
• GRAY, DAVID (1838-1861)
• GRAY, ELISHA (1835-1901)
• GRAY, HENRY PETERS (1819-18/7)
• GRAY, HORACE (1828–1902)
• GRAY, JOHN DE (d. 1214)
• GRAY, JOHN EDWARD (1800–1875)
• GRAY, PATRICK GRAY, 6TH BARON (d. 1612)
• GRAY, ROBERT (1809-1872)
• GRAY, SIR THOMAS (d. c. 1369)
• GRAY, THOMAS (1716-1771)

gray. is 5.9 . Crystals have been found only at Mt See also:

• VESUVIUS (also Vesevus in ancient poets)

Vesuvius, where they encrust See also:

• LAVA

lava, and in See also:

• CORNWALL

Cornwall . The other forms of the mineral, however, are See also:

• COMMON

common in copper mines, and have resulted by the alteration`' of chalcocite, chalcopyrite and other copper ores, on which they often form a superficial coating . (L .

J .