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Babkinite PB Bi (S, Se) : Crystal Data

Babkinite is a hexagonal mineral with the chemical formula Pb2Bi2(S,Se)3 that forms thin tablets up to 2 mm across. It has perfect cleavage, is silvery gray to white in color, and has a metallic luster. Babkinite is found in a hydrothermal deposit in sediments near their contact with a granite intrusion in Russia, associated with other minerals such as arsenopyrite and stannite. It is named after Russian geologist Petr Vasil'evich Babkin who first studied the deposit where it was discovered.

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89 views1 page

Babkinite PB Bi (S, Se) : Crystal Data

Babkinite is a hexagonal mineral with the chemical formula Pb2Bi2(S,Se)3 that forms thin tablets up to 2 mm across. It has perfect cleavage, is silvery gray to white in color, and has a metallic luster. Babkinite is found in a hydrothermal deposit in sediments near their contact with a granite intrusion in Russia, associated with other minerals such as arsenopyrite and stannite. It is named after Russian geologist Petr Vasil'evich Babkin who first studied the deposit where it was discovered.

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ramzchile
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Babkinite Pb2 Bi2 (S, Se)3

c 2001-2005 Mineral Data Publishing, version 1

Crystal Data: Hexagonal. Point Group: 3 2/m or 3. As thin tablets, in aggregates, to


2 mm across.

Physical Properties: Cleavage: Perfect, on {001}. Hardness = ∼2. VHN = 71–91,


82 average, ⊥ to cleavage; 90–112, 100 average, k to cleavage (10 g load). D(meas.) = n.d.
D(calc.) = 8.096

Optical Properties: Opaque. Color: Silvery gray; in reflected light, white with yellowish tint.
Streak: Gray. Luster: Metallic.
Optical Class: Uniaxial. Pleochroism: Weak in pale bluish brown tints. Anisotropism: Dis-
tinct. Bireflectance: Negligible.
R: (400) 51.3, (420) 50.7, (440) 49.6, (460) 48.7, (480) 48.6, (500) 48.5, (520) 47.8, (540) 47.5,
(560) 48.2, (580) 47.0, (600) 46.5, (620) 46.5, (640) 46.1, (660) 46.5, (680) 46.2, (700) 46.7

Cell Data: Space Group: P 31m or P 3. a = 4.191(2) c = 39.60(3) Z=3

X-ray Powder Pattern: Nevskoye deposit, Russia.


3.04 (10), 2.096 (8), 1.298 (7), 1.806 (6), 1.233 (6), 3.42 (5), 1.725 (5)

Chemistry: (1)
Ag 0.13
Pb 42.58
Sb 0.08
Bi 42.02
Se 10.60
S 5.80
Total 101.21
(1) Nevskoye deposit, Russia; by electron microprobe, average of 23 analyses; corresponds to
(Pb1.99 Ag0.01 )Σ=2.00 (Bi1.95 Sb0.01 )Σ=1.96 (S1.75 Se1.30 )Σ=3.05 .

Occurrence: In a hydrothermal deposit in sediments, near their contact with a granite


intrusion.

Association: Arsenopyrite, stannite, tetrahedrite, wittite, laitakarite, selenian cosalite,


cassiterite, wolframite.

Distribution: From the Nevskoye W–Sn deposit, 25 km northwest of Omsukchan, Magadan


region, Russia.

Name: To honor Petr Vasil’evich Babkin (1929–1977), Russian geologist, Northeast Geological
Administration of Mingeo, Magadan, Russia, who first studied the Nevskoye deposit.

Type Material: A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia,
p806/1.

References: (1) Bryzgalov, I.A., E.M. Spiridonov, I.V. Petrova, and M.S. Sakharova (1996)
Babkinite Pb2 Bi2 (S, Se)3 – a new mineral. Doklady Acad. Nauk SSSR, 346, 656–659 (in Russian).
(2) (1996) Amer. Mineral., 81, 1513–1518 (abs. ref. 1).

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in
any form or by any means, electronic, mechanical, photocopying, recording, or otherwise without the prior written
permission of Mineral Data Publishing.

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