Diaphorite

Pb2 Ag3 Sb3 S8
c 2001-2005 Mineral Data Publishing, version 1Crystal Data: Monoclinic. Point Group: P 2/m. Prismatic by elongation k [001]; typicallystriated k [001]; highly complex crystals, to nearly 1 cm; commonly as exsolutions and inclusions
in galena. Twinning: On {120} and {241}.
Physical Properties: Fracture: Subconchoidal to uneven. Tenacity: Brittle.
Hardness = 2.5–3 VHN = n.d. D(meas.) = 6.04 D(calc.) = 6.019
Optical Properties: Opaque. Color: Steel-gray; in polished section, white to grayish white.
Luster: Metallic. Anisotropism: Strong.
R1 –R2 : (400) 38.2–40.1, (420) 37.8–39.8, (440) 37.5–39.5, (460) 37.3–39.3, (480) 37.0–39.0, (500)36.7–38.8, (520) 36.4–38.6, (540) 36.0–38.3, (560) 35.6–38.0, (580) 35.3–37.8, (600) 35.0–37.4, (620)
34.8–37.2, (640) 34.5–37.0, (660) 34.2–36.6, (680) 33.8–36.1, (700) 33.4–35.8
Cell Data: Space Group: P 21 /a. a = 15.849(4)β = 116◦ 25.5(2)0 Z = 4

b = 17.914(4)c = 5.901(1)

X-ray Powder Pattern: Machacamarca, Bolivia.
3.29 (10), 2.81 (8), 2.03 (5), 1.704 (4), 2.93 (3), 1.759 (3), 1.653 (2)Chemistry:PbAgFeCuSbS

(1)
28.67
23.44
0.67
0.73
26.43
20.18

(2)
28.6
24.4

(3)
30.48
23.78

28.6
18.0

26.87
18.87

Total 100.12
99.6
100.00(1) Přı́bram, Czech Republic; corresponds to Pb1.80 Ag2.76 Fe0.15 Cu0.15 Sb2.76 S8.00 . (2) Santa
Maria de Catorze, Mexico; by electron microprobe, corresponding to Pb1.97 Ag3.22 Sb3.35 S8.00 .
(3) Pb2 Ag3 Sb3 S8 .
Occurrence:

In hydrothermal veins with other sulfides formed at medium temperatures.

Association:Galena, sphalerite, miargyrite, pyrargyrite, pyrite, siderite, quartz.

Distribution: In the Czech Republic, from Přı́bram [TL] and Kutná Hora. In Germany, inSaxony, at Bräunsdorf, near Freiberg [TL], in the Neues Hoffnung Gottes mine; at Freiberg; andin the Alte Hoffnung Gottes mine, Voigtsberg. [??ck if Saxony??] From Baia Sprie (Felsőbánya)
and Baia Mare (Nagybánya), Romania. From Fournial, Cantal, and Pontgibaud, Puy-de-Dôme,France. In the Mangazeika and Bulatsk Pb–Zn deposits, northeastern Sakha, Russia. In theUSA, from the Lake Chelan district, Chelan Co., Washington; the Wood River deposits, Mineral
Hill district, Blaine Co., Idaho; and near Morey, Nye Co., Nevada. At Santa Maria de Catorze,
San Luis Potosı́, Mexico. From Zancudo, Colombia. At Machacamarca and Cerro Rico, Potosı́,Bolivia. From the Pirquitas deposit, Riconada Department, Jujuy Province, Argentina. Known
from a number of other localities.
Name:From the Greek for difference, as being distinct from freieslebenite.

References: (1) Palache, C., H. Berman, and C. Frondel (1944) Dana’s system of mineralogy,(7th edition), v. I, 414–415. (2) Hellner, E. (1958) Über komplex zusammengesetzte Spiessglanze
III. Zur Struktur des Diaphorits, Ag3 Pb2 Sb3 S8 . Zeits. Krist., 110, 169–174 (in German withEnglish abs.). (3) Berry, L.G. and R.M. Thompson (1962) X-ray powder data for the ore minerals.
Geol. Soc. Amer. Mem. 85, 136. (4) Criddle, A.J. and C.J. Stanley, Eds. (1993) Quantitative data
file for ore minerals, 3rd ed. Chapman & Hall, London, 140.
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