A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...

THE MINERALOGY OF ANTIMONY. 37
Occurrence.—Associated with quartz, calcitc, and pyrito in
Auvergne, in the Vosges, at Anglar and La Crouso.
Biiidheimite.
Composition.—Hydratcd antimonato of lead, Pb3SbL,O8 + 4H2O or
2PbO.Sb2Of,.3H2O or PbO.Sb2O6.H2O.
Properties.—Amorphous, rcniform or spheroidal. H. = 4. (*. =
4*60-4*76. Lustre resinous, dull or earthy. Colour white, gray,
brownish, yellowish. Streak white to grayish or yellowish.
Occurrence.—A product of the decomposition of other antimonial
ores. At Nerchinsk, Siberia; Horhauscn; in Cornwall; in Sevier
Co., Arkansas.
Boulangerite.
Compodtion.—Vhtpo^ or 3PbS.Sb2Ss.
Properties.—In plumose masses, showing on tho fracture a crystalline
structure; also granular and compact. H. = 2*5-3. (•». = 5*70~(K).
Lustro metallic. Colour bluish lead-gray. Behaves before the blowpipe
like zinkenite.
Occurrence.—Abundant at Molierca, Franco ; in Lapland ; at Nerchinsk
; Obor-Lahr in Sayn-Altenkirohen ; JSilborsand, near jMayonco,
in tho Eifel; Wolfsbcrg in the Fl'arz ; Pi-ibram in Bohemia; and near
Bottino in Tuscany.
Bournonite.
Composition.—(Vh : Cu.,)8Sb2Stt or (Tb : Guo)S.Sb2S8 -= PbCuHbS8 (if
I > l):Cu2-2:l).
Properties.—Orthoi'hombic. Twins, often repeated, forming' r/ruciibrm
and wheel-shaped crystals. CryntaLs short priHmatie to tabular ;
often in parallel juxtaposition; prismatic facea often vertically
ntriated. Also massive, granular, compact. Kathcr brittle. 11.»
2*5-3. (*. = 5*7-5*9. Lustre metallic. Colour and streak Htool-gray.
Opaque.
Occu/rrence.-—At Noudorf, WolfnlnTg, ClauHtlial, and AndrcuHlxu'g,
in tho H'arz * at Pribram in Bohemia ; at Kapnik, Hungary ; at Sorvoss
in Piedmont; and in Cornwall.
Breithanptite.
Composition.—Ni£>b ; arsenic IH .sometimeH })roHOiit.
Properties.—Hexagonal; crystals thin, tabular. Arborescent and