antimony - Sciencemadness.org

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