REALGAR  , a See also:

• MINERAL

mineral See also:

• SPECIES

species consisting of See also:

• ARSENIC (symbol As, atomic weight 75.0)

arsenic mono-sulphide (See also:

• ASS (O.E. assa; Lat. asinus)
• ASS, FEAST OF THE

AsS) and occurring as See also:

• MONOCLINIC

monoclinic crystals of a See also:

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

bright red See also:

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

colour . There is a perfect cleavage parallel to the See also:

• PLANE

plane of symmetry (r in fig.) . The lustre is resinous, and the streak has the same colour as • the crystals, namely, See also:

• ORANGE
• ORANGE (Citrus Aurantium)
• ORANGE, HOUSE OF

orange-red to See also:

• AURORA
• AURORA (perhaps through a form ausosa from Sansk. ush, to burn ; the common idea of " brightness " suggests a connexion with aurum, gold)

aurora-red . The hardness is I2–2 and the specific gravity 3'55 . On exposure to See also:

• LIGHT

light the crystals crumble to a yellow See also:

• POWDER (through O. Fr. puldre, modern poudre, from Lat. pulvis, pulveris, dust)

powder . The name realgar is of Arabic origin, and was used by the alchemists; the substance was known to See also:

• THEOPHRASTUS

Theophrastus under the name EavbaplKrt, and to See also:

• PLINY, THE ELDER
• PLINY, THE YOUNGER

Pliny as Sandaracha . The mineral usually occurs in association with the yellow arsenic sulphide, See also:

• ORPIMENT (auripigmentum)

orpiment . See also:

• GOOD, JOHN MASON (1764-1827)

Good crystals are found with ores of See also:

• SILVER

silver and See also:

• LEAD
• LEAD (pronounced iced)

lead in the mineral See also:

• VEINS

veins of Felsobanya, near Nagy-Banya, Kapnik-Banya and Nagyag, near See also:

• DEVA (mod. Chester)
• DEVA (Sanskrit " heavenly ")

Deva, in See also:

• HUNGARY
• HUNGARY (Hungarian Magyarorszdg)

Hungary; with See also:

• BLENDE, or SPHALERITE

blende in the See also:

• WHITE
• WHITE, ANDREW DICKSON (1832– )
• WHITE, GILBERT (1720–1793)
• WHITE, HENRY KIRKE (1785-1806)
• WHITE, HUGH LAWSON (1773-1840)
• WHITE, JOSEPH BLANCO (1775-1841)
• WHITE, RICHARD GRANT (1822-1885)
• WHITE, ROBERT (1645-1704)
• WHITE, SIR GEORGE STUART (1835– )
• WHITE, SIR THOMAS (1492-1567)
• WHITE, SIR WILLIAM ARTHUR (1824--1891)
• WHITE, SIR WILLIAM HENRY (1845– )
• WHITE, THOMAS (1628-1698)
• WHITE, THOMAS (c. 1550-1624)

white crystalline See also:

• DOLOMITE

dolomite of the Binnenthal in See also:

• SWITZERLAND

Switzerland; and in a See also:

• BED
• BED (a common Teutonic word, cf. German Bett, probably connected with the Indo-European root bhodh, seen in the Lat. fodere, to dig; so " a dug-out place " for safe resting, or in the same sense as a garden " bed ")

bed of sandy See also:

• CLAY (from O. Eng. claeg, a word common in various forms to Teutonic languages, cf. Ger. Klei)
• CLAY, CASSIUS MARCELLUS (1810-1903)
• CLAY, CHARLES (1801–1893)
• CLAY, FREDERIC (1838–1889)
• CLAY, HENRY (1777–1852)

clay at Mercur in See also:

• UTAH

Utah . It is deposited by the solfataras near See also:

• NAPLES
• NAPLES (Ital. Napoli, and Lat. Neapolis)
• NAPLES, KINGDOM OF

Naples and by the hot springs of the Yellowstone See also:

• NATIONAL

National See also:

• PARK (Fr. part; Ital. parco; Sp. Marque; O.Eng. pearroc; connected with Ger. pferch, fold, and pfarrei, district, translating med. Lat. parochia, parish)
• PARK, EDWARDS AMASA (1808–1900)
• PARK, MUNGO (1771-1806?)

Park . Realgar has been used as a pigment and in pyrotechny for producing a brilliant white 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; but it is now replaced by the artificially prepared See also:

• COMPOUND
• COMPOUND (from Lat. componere, to combine or put together)

compound . The other native arsenic sulphide, As2S3, known as orpiment (See also:

• LAT

Lat. auripigmentum, meaning " See also:

• GOLDEN

golden paint " ), occurs as foliated masses of a See also:

• LEMON
• LEMON, MARK (1809-1870)

lemon-yellow colour, the foliation being parallel to a direction of perfect cleavage . It is sectile and soft (H.=12 2), and has a specific gravity 3.4 .

Distinctly See also:

• DEVELOPED

developed crystals are rare; they have usually been considered to be orthorhombic and isomorphous with See also:

• STIBNITE

stibnite (Sb2S3), but it is probable that they are really monoclinic . Orpiment is extensively See also:

• MINED

mined near Julamerk in See also:

• ASIATIC

Asiatic See also:

• TURKEY

Turkey . (L . J .