Fülöppite

Pb3 Sb8 S15
c 2001-2005 Mineral Data Publishing, version 1Crystal Data: Monoclinic. Point Group: 2/m. Crystals short prismatic [201], to 3 mm, andpyramidal; striated on {100} k [010] and on {112} k [110]; curved crystals common.
Physical Properties: Fracture: Uneven. Tenacity: Brittle. Hardness = 2.5
VHN = 140–157 (100 g load). D(meas.) = 5.22 D(calc.) = 5.19
Optical Properties: Opaque. Color: Lead-gray; may tarnish steel-blue or bronzy white inpolished section. Streak: Reddish gray. Luster: Metallic. Anisotropism: May be weak in bluishgray, moderate in blue-green to red-brown.
R1 –R2 : (400) 37.8–45.9, (420) 37.6–45.7, (440) 37.3–45.2, (460) 37.1–44.6, (480) 37.0–44.0, (500)36.7–43.4, (520) 36.3–42.6, (540) 36.1–42.0, (560) 35.9–41.3, (580) 35.4–40.5, (600) 34.6–39.3, (620)
33.6–38.1, (640) 32.5–36.9, (660) 31.6–35.9, (680) 30.8–35.1, 700) 30.1–34.4
Cell Data:
Z=4Space Group: C2/c. a = 13.441

b = 11.726

c = 16.930

β = 94.71(8)◦X-ray Powder Pattern: Baia Mare, Romania.
3.89 (100), 3.20 (90), 2.919 (80), 2.822 (80), 3.23 (70), 2.749 (70), 6.25 (50)
Chemistry:PbSbS
rem.

(1)
28.29
47.50
24.10
0.19

(2)
30.6
47.0
23.1

(3)
29.93
46.91
23.16

Total 100.08
100.7
100.00(1) Baia Mare, Romania; remainder is SiO2 , corresponds to Pb2.95 Sb7.90 S15.00 . (2) Skalnoye
deposit, Kazakhstan; [??by electron microprobe??,] corresponds to Pb3.01 Sb8.02 S15.00 .
(3) Pb3 Sb8 S15 .
Occurrence:Of hydrothermal origin.

Association: Zinkenite, semseyite, fizélyite, andorite, freieslebenite, geocronite, boulangerite,jamesonite, cinnabar, sphalerite, marcasite, quartz, dolomite.
Distribution: In Romania, in the Baia Mare (Nagybánya) district, from the Dealul Crucii(Kereszthegy) [TL] and Herja mines. At Wet Swine Gill, Caldbeck Fells, Cumbria, England. InFrance, from Auliac, Cantal; Bodennec and Bournac, Montagne Noire, [Hérault??not=??so doublecheck both Bodennec and Bournac localities??] Finistère. From the North Altyntopkan Pb–Zn
skarn deposit, northwestern Karamazar, Tajikistan. At the Skalnoye Hg–Sb deposit, centralKazakhstan. In the Lake George antimony deposit, 40 km west of Fredricton, New Brunswick,Canada.
Name:For Dr. Béla Fülöpp (1863–1938), mineral collector of Hungary.

Type Material:

The Natural History Museum, London, England, 1929,248.

References: (1) Palache, C., H. Berman, and C. Frondel (1944) Dana’s system of mineralogy,(7th edition), v. I, 463–464. (2) Jambor, J.L. (1969) Sulfosalts of the plagionite group.
Mineral. Mag., 37, 442–446. (3) Nuffield, E.W. (1975) The crystal structure of fülöppite,
Pb3 Sb8 S15 . Acta Cryst., 31, 151–157. (4) Swinnea, J.S., A.J. Tenorio, and H. Steinfink(1985) Sb10 S15 , a Pb-free analog of fülöppite, Pb3 Sb8 S15 . Amer. Mineral., 70, 1056–1058.
(5) Vershkovskaya, O.V., D.K. Shcherbachev, O.Y. Yushko-Zakharova, L.S. Dubakina, and I.Y.
Maksimyuk (1984) First fülöppite find in mercury-antimony ore. Doklady Acad. Nauk SSSR, 264,1203–1206 (in Russian). (6) Criddle, A.J. and C.J. Stanley, Eds. (1993) Quantitative data file forore minerals, 3rd ed. Chapman & Hall, London, 180.
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