PYROMORPHITE  , a See also:

• MINERAL

mineral See also:

• SPECIES

species composed of See also:

• LEAD
• LEAD (pronounced iced)

lead chloro- Crystals are See also:

• COMMON

common, and have the See also:

• FORM (Lat. forma)

form of a hexagonal See also:

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

prism terminated by the basal planes, sometimes combined with narrow faces of a hexagonal See also:

• PYRAMID

pyramid . Crystals with a See also:

• BARREL (a word of uncertain origin common to Romance languages; the Celtic forms, as in the Gaelic baraill, are derived from the English)

barrel-like curvature are not uncommon . Globular and reniform masses are also found . As proved by the etched figures on the faces, crystals possess the same parallel-faced hemihedrism as See also:

• APATITE

apatite, with which mineral pyromorphite and also See also:

• MIMETITE

mimetite are isomorphous . Between pyromorphite and the corresponding chloro-arsenate (mimetite, (q.v.) the resemblance in See also:

• EXTERNAL

external characters is so See also:

• CLOSE
• CLOSE (from Lat. clausum, shut)
• CLOSE, MAXWELL HENRY (1822-1903)

close that, as a See also:

• RULE

rule, it is only possible to distinguish between them by chemical tests: and they were formerly confused under the names " 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 lead ore " and " 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 lead ore " (See also:

• GERMAN
• GERMAN, DUTCH AND SCANDINAVIAN

German, Griinbleierz and Braunbleierz) . The phosphate was first distinguished chemically by M . H . See also:

• KLAPROTH, HEINRICH JULIUS (1783-1835)
• KLAPROTH, MARTIN HEINRICH (1743-1817)

Klaproth, in 1784, and it was named pyromorphite by J . F . L . See also:

• HAUSMANN, JOHANN FRIEDRICH LUDWIG (1782-1859)

Hausmann in 1813, being so named from the Gr. xup (See also:

• FIRE (in O. Eng. f j'r; the word is common to West German languages, cf. Dutch vuur, Ger. Feuer; the pre-Teutonic form is seen in Sanskrit pu, pavaka, and Gr. irup; the ultimate origin is usually taken to be a root meaning to purify, cf. Lat. purus)

fire) and uopcpn (form), because when a fragment of the mineral is fused the globule assumes a faceted form on solidifying . The See also:

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

colour of the mineral is usually some See also:

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

bright shade of green, yellow or brown, and the lustre is resinous .

The hardness is 3 and the specific gravity 6.5–7.1 . Owing to isomorphous replacement of the See also:

• PHOSPHORUS (Gr. 4ws, light, sPEpety, to bear)

phosphorus by See also:

• ARSENIC (symbol As, atomic weight 75.0)

arsenic there may be a ‘.See also:

• GRADUAL (Med. Lat. gradualis, of or belonging to steps or degrees; gradus, step)

gradual passage from pyromorphite to mimetite . Varieties containing See also:

• CALCIUM [symbol Ca, atomic weight 40.0 (o= x6)]

calcium isomorphously replacing lead are See also:

• LOWER

lower in .See also:

• DENSITY (Lat. densus, thick)

density' (specific gravity 5.9–6.5) and usually lighter in colour; they See also:

• BEAR
• BEAR, BLACK
• BEAR, BROWN
• BEAR, GRIZZLY
• BEAR, ISABELLINE
• BEAR, WHITE

bear the names " polysphaerite " (because of the globular fotm),'°` miesite " from Mies in Bohemia, " nussierite from Nu8sihre near See also:

• BEAUJEU

Beaujeu, See also:

• RHONE
• RHONE (Fr. Rhone, Lat. Rhodanus)

Rhone, See also:

• FRANCE
• FRANCE, ANATOLE (1844– )

France, and " cherokine" from See also:

• CHEROKEE
• CHEROKEE (native Tsalagi, " cave people ")

Cherokee See also:

• COUNTY (through Norm. Fr. comae, cf. O. Fr. cunte, conk', Mod. Fr. comae, from Lat. comitatus, cf. Ital. comitato, Prov. comtat; see COUNT)

county in See also:

• GEORGIA

Georgia . 694 Pyromorphite has resulted from the alteration of See also:

• GALENA

galena in the oxidized portions of metalliferous See also:

• VEINS

veins, and is frequently met with in the upper levels of lead mines . Finely crystallized specimens have been found at Braubach and See also:

• EMS

Ems in See also:

• NASSAU

Nassau, Wheal See also:

• ALFRED

Alfred in See also:

• CORNWALL

Cornwall, Roughten Gill in See also:

• CUMBERLAND
• CUMBERLAND, DUKES AND EARLS OF
• CUMBERLAND, RICHARD (1632-1718)
• CUMBERLAND, RICHARD (1732-1811)
• CUMBERLAND, WILLIAM AUGUSTUS

Cumberland, See also:

• LEADHILLS

Leadhills in See also:

• SCOTLAND
• SCOTLAND, CHURCH OF
• SCOTLAND, EPISCOPAL CHURCH OF

Scotland, See also:

• PHOENIXVILLE

Phoenixville in See also:

• PENNSYLVANIA
• PENNSYLVANIA, UNIVERSITY OF

Pennsylvania, Huelgoat in See also:

• FINISTERE, or FINISTERRE

Finistere, See also:

• BRITTANY

Brittany, &c . At the last-named locality, as well as at Wheal See also:

• HOPE, ANTHONY
• HOPE, THOMAS (c. 1770-1831)

Hope, near See also:

• TRURO
• TRURO, THOMAS WILDE, 1ST BARON (1782-1855)

Truro in Cornwall, there were formerly found curious pseudomorphs of galena after pyromorphite, known as " See also:

• BLUE (common in different forms to most European languages)

blue lead ore." (L . J .