Tvalchrelidzeite Mineral Data

Tvalchrelidzeite Mineral Data +

General Tvalchrelidzeite Information

Chemical Formula:

Hg12(Sb,As)8S15

Composition:

Molecular Weight = 3,708.47 gm

Mercury 64.91 % Hg

Antimony 14.45 % Sb

Arsenic 7.68 % As

Sulfur 12.97 % S

______

100.00 %

Empirical Formula:

Hg₁₂Sb_4.4As_3.8S₁₅

Environment:

In a hydrothermal As-Sb-Hg deposit.

IMA Status:

Approved IMA 1975

Locality:

In the Gomi deposit, Caucasus mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for A. A. Tvalchrelidze, founder of the Georgian Mineralogical-Petrographic School, Russia.

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Tvalchrelidzeite Crystallography

Axial Ratios:

a:b:c =0.3794:1:1.3537

Cell Dimensions:

a = 4.391, b = 11.573, c = 15.667, Z = 1; alpha = 88.17°, beta = 90.01°, gamma = 89.98° V = 795.74 Den(Calc)= 7.74

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.92(1), 2.98(1), 3.49(1),

Physical Properties of Tvalchrelidzeite

Cleavage:

[???] Perfect

Color:

Lead gray.

Density:

7.38

Diaphaniety:

Translucent to Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3 - Calcite

Luster:

Adamantine

Streak:

reddish black

Optical Properties of Tvalchrelidzeite

RL Anisotrophism:

Distinct, dark olive to dark violet.

RL Color:

Whitish lead gray, with dark red internal reflections, cherry red in transmitted light.

RL Pleochroism:

White to grayish white, weak lilac to a distinctly greenish tint.

Calculated Properties of Tvalchrelidzeite

Electron Density:

r_electron=6.47 gm/cc
note: r_{Tvalchrelidzeite}=7.74 gm/cc.

Fermion Index

Fermion Index = 0.19699
Boson Index = 0.80301

Photoelectric:

PE_{Tvalchrelidzeite}=1,156.73 barns/electron
U=PE_{Tvalchrelidzeite} x r_electron=7,483.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tvalchrelidzeite is Not Radioactive

Tvalchrelidzeite Classification

Dana Class:

3.8.3.1 (3)Sulfides - Sulfosalts

(3.8)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.8.3)Dana Group

3.8.3.1 Tvalchrelidzeite Hg12(Sb,As)8S15 P1 1

Strunz Class:

II/E.13-70 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Thallium and Mercury, x = 4.0 - 1.6

II/E.13 - Livingstonite - Vaughanite series

II/E.13-10 Livingstonite HgSb4S8 A2/a 2/m

II/E.13-20 Grumiplucite! HgBi2S4 C 2/m 2/m

II/E.13-30 Simonite TlHgAs3S6 P 2₁/n 2/m

II/E.13-40 Vrbaite Tl4Hg3Sb2As8S20 C mca 2/m 2/m 2/m

II/E.13-42 Edenharterite TlPbAs3S6 F dd2 mm2

II/E.13-43 Jentschite! TlPbAs2SbS6 P 2₁/n 2/m

II/E.13-45 Hutchinsonite (Pb,Tl)2As5S9 P bca 2/m 2/m 2/m

II/E.13-50 Lorandite TlAsS2 P 2₁/a 2/m

II/E.13-60 Weissbergite TlSbS2 P1 1

II/E.13-70 Tvalchrelidzeite Hg12(Sb,As)8S15 P1 1

II/E.13-80 Vaughanite TlHgSb4S7 P1 ? 1

Other Tvalchrelidzeite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Tvalchrelidzeite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Tvalchrelidzeite

Hg12(Sb,As)8S15
Dana No: 3.8.3.1 Strunz No: II/E.13-70
Locality:

Notes: