Aktashite Mineral Data

Aktashite Mineral Data +

General Aktashite Information

Chemical Formula:

Cu6Hg3As4S12

Composition:

Molecular Weight = 1,667.52 gm

Copper 22.86 % Cu

Mercury 36.09 % Hg

Arsenic 17.97 % As

Sulfur 23.08 % S

______

100.00 %

Empirical Formula:

Cu₆Hg₃As₄S₁₂

Environment:

Hydrothermal deposits.

IMA Status:

Approved IMA 1968

Locality:

Gal-Kyaya deposit, Yakutia, and Aktash deposit, Altai Mts., Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

ICSD 20424

PDF 25-298

Aktashite Image

Images:

Aktashite

Comments: Metallic gray grain of aktashite in quartz gangue.
Location: Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Aktashite Crystallography

Axial Ratios:

a:c = 1:0.6793

Cell Dimensions:

a = 13.72, c = 9.32, Z = 3; V = 1,519.34 Den(Calc)= 5.47

Crystal System:

Trigonal - PyramidalH-M Symbol (3) Space Group: R 3

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

By Intensity(I/I_o): 3.12(1), 1.909(0.54), 1.627(0.4),

Crystal Structure:

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Kaplunik L N , Pobedimskaya E A , Belov N V , Doklady Akademii Nauk SSSR , 251 (1980) p.96-98, Kristallicheskaya struktura aktashimita Cu6Hg3As4S12

Physical Properties of Aktashite

Cleavage:

None

Color:

Grayish black.

Density:

5.5

Diaphaniety:

Opaque

Fracture:

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

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Streak:

black

Optical Properties of Aktashite

RL Anisotrophism:

Weak in shades of blue.

RL Color:

White.

Calculated Properties of Aktashite

Electron Density:

r_electron=4.84 gm/cc
note: r_Aktashite=5.47 gm/cc.

Fermion Index

Fermion Index = 0.11071
Boson Index = 0.88929

Photoelectric:

PE_Aktashite= 602.40 barns/electron
U=PE_Aktashite x r_electron=2,916.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aktashite is Not Radioactive

Aktashite Classification

Dana Class:

3.4.13.2 (3)Sulfides - Sulfosalts

(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.4.13)Dana Group

3.4.13.1 Nowackiite Cu6Zn3As4S12 R 3 3

3.4.13.2 Aktashite Cu6Hg3As4S12 R 3 3

3.4.13.3 Gruzdevite Cu6Hg3Sb4S12 R 3 3

Strunz Class:

II/C.12-30 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.12 - Tetrahedrite group, Watanabeite - Gruzdevite series

II/C.12-05 Watanabeite Cu4(As,Sb)2S5 Unk Ortho

II/C.12-10 Sinnerite Cu6As4S9 P1 1

II/C.12-20 Nowackiite Cu6Zn3As4S12 R 3 3

II/C.12-30 Aktashite Cu6Hg3As4S12 R 3 3

II/C.12-40 Gruzdevite Cu6Hg3Sb4S12 R 3 3

Other Aktashite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Aktashite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Aktashite Specimen Label here :

Aktashite

Cu6Hg3As4S12
Dana No: 3.4.13.2 Strunz No: II/C.12-30
Locality:

Notes: