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Encyclopedia Britannica

MELACONITE

This article appears in Volume V18, Page 87 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: MEC-MIC

MELACONITE , a

mineral

MINERAL

consisting of cupric

oxide

OXIDE

, CuO, and known also as black copper ore. In

appearance

APPEARANCE (from Lat. apparere, to appear)

it is strikingly different from cuprite (q.v.) or red copper ore, which is cuprous

oxide

OXIDE

. Crystals are rare; they belong to the mono-clinic, or possibly to the anorthic

system

SYSTEM

, and have the form of thin triangular or hexagonal scales with a steel-grey colour and brilliant metallic lustre. More often the

mineral

MINERAL

is massive, earthy or pulverulent, and has a dull

iron

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

-black colour. Hence the name melaconite, from the

Greek

GREEK
GREEK, ETRUSCAN AND

Eras, black and rthvis, dust, which was originally given by F. S.

Beudant

BEUDANT, FRANCOIS SULPICE (1787—1850)

in 1832 in the form melaconise. The crystallized Vesuvian mineral was later named tenorite, a name commonly adopted for the species. The hardness of the crystals is 3-4, but the earthy and powdery forms readily soil the fingers; the spec. gray. is 5.9. Crystals have been found only at Mt

Vesuvius

VESUVIUS (also Vesevus in ancient poets)

, where they encrust

lava

LAVA

, and in

Cornwall

CORNWALL

. The other forms of the mineral, however, are 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. S.)

End of Article: MELACONITE

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JCSM is a 501(c)(3), non-profit organization. Copyright © 1997-present.