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Handbook of
MINERALOGY
Anthony + Bideaux + Bladh +
Nichols
" I checked the numerical
data for a large number of species and found it
to be carefully
recorded. Typographical errors were not observed
... "
- P.J. Dunn, Mineral.
Record
A FACSIMILE OF A SAMPLE PAGE
FROM VOLUME I FOLLOWS:
Tvalchrelidzeite
Hg12(Sb,As)8S15
Crystal Data:
Monoclinic. Point
Group: n.d. As granular aggregates, without well
formed
crystals.
Physical Properties: Cleavage:
Perfect in one direction. Fracture: Uneven and
conchoidal.
Hardness = < 3 VHN = 172
D(meas.) = 7.380(5) D(calc.) = 7.74
Optical Properties: Translucent.
Color: Lead-gray; whitish in reflected light, with
strong
dark red internal reflections; in
transmitted light, cherry-red. Streak: Nearly
black, with a
dark reddish tint. Luster:
Adamantine. Pleochroism: White to grayish white,
weak lilac to a
distinctly greenish tint. Anisotropism:
Distinct, dark olive to dark violet.
R1 – R2:
n.d.
Cell Data: Space Group:
n.d. a = 11.51(4) b = 4.39(2) c =
14.62(6) b = 92.14°
Z = 1
X-ray Powder Pattern: Gomi
deposit, USSR.
3.49 (100), 2.92
(100), 2.89 (100), 2.080 (100), 3.29
(70), 2.031 (35), 3.19 (30)
Chemistry:
(1)
(2)
(3)
Hg
64.60
64.94
66.1
Cu
0.15
Sb
14.32
14.12
12.9
As
7.60
7.75
8.54
S
12.83
12.71
10.3
Total
99.35
99.52
97.99
(1) Gomi deposit, USSR; by
electron microprobe, corresponding to Hg12(Sb4.38As3.78)S
= 8.16S14.92.
(2) Do.;
corresponds to Hg12(Sb4.30As3.84)S
= 8.14S14.69. (3) Tyute
deposit, USSR; by electron
microprobe.
Occurrence: In a hydrothermal
As-Sb-Hg deposit (Gomi deposit, USSR).
Association: Cinnabar,
metacinnabar, realgar, dickite (Gomi deposit, USSR).
Distribution: In the Gomi
deposit, Caucasus Mountains, Georgian SSR, and the Tyute
mercury deposit, Altai Mountains,
USSR. From the Hemlo gold deposit, Thunder Bay district,
Ontario, Canada. In the Getchell
mine, Humboldt Co., Nevada, USA.
Name: For A.A. Tvalchrelidze,
founder of the Georgian Mineralogical-Petrographical
School,
USSR.
Type Material: A.E. Fersman
Mineralogical Museum, Academy of Sciences, Moscow, USSR;
National Museum of Natural
History, Washington, D.C., USA, 143827.
References: (1) Grusdev, V.S.,
N.M. Mchedlishvili, G.A. Terekhova, Z.Y. Tsertsvadze,
N.M.
Chernitsova, and N.G. Shumkova
(1975) Tvalchrelidzeite, Hg12 (Sb,As)8S15,
a new mineral from
the Gomi arsenic-antimony mercury
deposit, Caucasus. Doklady Acad. Nauk SSSR, 225, 911-913
(in Russian). (2) (1977)
Amer. Mineral., 62, 174 (abs. ref. 1). (3)
Vasil’ev, V.I. (1979) The
second discovery of
tvalchrelidzeite, Hg12 (Sb,As)8S15
in ores of mercury deposits. Geol. Geofiz., 9,
159-162 (in Russian with English
abs.). (4) Chem. Abs., 92, 35693 (abs. ref. 3).
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