OLIVENITE

This article appears in Volume V20, Page 88 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: NUM-ORC

OLIVENITE , a

mineral

MINERAL

consisting of basic copper arsenate with the

formula

Cu2(OH)AsO4 It crystallizes in the ortho-
rhombic system, and is sometimes found in small brilliant crystals of simple prismatic habit terminated by domal faces. More usually, however, it occurs as globular aggregates of acicular crystals, these fibrous forms often having a velvety lustre: sometimes it is lamellar in structure, or soft and earthy. A characteristic feature, and one to which the name alludes (German, Olivenerz, of A. G. Werner, 1789), is the olive-green colour, which varies in shade from blackish-green in the crystals to almost white in the finely fibrous variety known as "

wood

WOOD, ANTHONY A2 (1632-1695)
WOOD, JOHN GEORGE (1827—1889)
WOOD, MRS
HENRY
- HENRY
- HENRY (1129-1195)
- HENRY (c. 1108-1139)
- HENRY (c. 1174–1216)
- HENRY (Fr. Henri; Span. Enrique; Ger. Heinrich; Mid. H. Ger. Heinrich and Heimrich; O.H.G. Haimi- or Heimirih, i.e. " prince, or chief of the house," from O.H.G.
  heim
  - HEIM, ALBERT VON ST GALLEN (1849- )
  - HEIM, FRANCOIS JOSEPH (1787-1865)
  , the Eng.
  home
  - HOME
  - HOME, DANIEL DUNGLAS (1833-1886)
  - HOME, EARLS OF
  , and rih, Goth. reiks; compare Lat. rex " king "—" rich," therefore " mig
- HENRY, EDWARD LAMSON (1841– )
- HENRY, JAMES (1798-1876)
- HENRY, JOSEPH (1797-1878)
- HENRY, MATTHEW (1662-1714)
- HENRY, PATRICK (1736–1799)
- HENRY, PRINCE OF
  BATTENBERG
  - BATTENBERG
  (1858-1896)
- HENRY, ROBERT (1718-1790)
- HENRY, VICTOR (1850– )
- HENRY, WILLIAM (1795-1836)
[ELLEN] (1814—1887)
WOOD, SEARLES VALENTINE (1798—188o)

-copper." The hardness is 3, and the sp. gr. 4'3. The

mineral

MINERAL

was formerly found in some abundance, associated with limonite and quartz, in the upper workings in the copper mines of the St Day

district

DISTRICT

Cornwall

CORNWALL

; also near Redruth, and in the Tintic

district

DISTRICT

in Utah. It is a mineral of secondary origin, having been formed by the alteration of copper ores and mispickel.
The arsenic of olivenite is sometimes partly replaced by a small amount of phosphorus, and in the species libethenite we have the corresponding basic copper phosphate Cu2(OH)PO4. This is found as small dark green crystals resembling olivenite at Libethen in

Hungary

HUNGARY
HUNGARY (Hungarian Magyarorszdg)

, and in small amount also in

Cornwall

CORNWALL

. Other members of this isomorphous group of minerals are adamite, Zn2(OH)AsO4, and descloiz?te (q.v.). (L. J. S.)

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