Baumstarkite Mineral Data

Baumstarkite Mineral Data

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General Baumstarkite Information

Chemical Formula:

Ag3(Sb,As)2SbS6

Composition:

Molecular Weight = 869.54 gm

Silver 37.22 % Ag

Antimony 38.50 % Sb

Arsenic 2.15 % As

Sulfur 22.13 % S

______

100.00 %

Empirical Formula:

Ag₃Sb_2.75As_0.25S₆

Environment:

Found coating miargyrite. Polymorphic relationship with miargyrite and cuboargyrite

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

San Genaro mine, Huancavelica Department, Peru. Link to MinDat.org Location Data.

Name Origin:

Named for Manfred Baumstark(1954-), German mineralogist who first recognized the mineral.

Synonym:

IMA1999-049

Baumstarkite Image

Images:

Baumstarkite

Comments: Fragments of baumstarkite with zoning of darker lamellae with higher As content. (AmMin 87:755).
Location: San Genaro mine, Huancavelica Department, Peru.. Scale: See Image.
© American Mineralogist

Baumstarkite Crystallography

Axial Ratios:

a:b:c =0.9331:1:1.0591

Cell Dimensions:

a = 7.766, b = 8.322, c = 8.814, Z = 2; alpha = 100.62°, beta = 104.03°, gamma = 90.22° V = 543.17 Den(Calc)= 5.32

Crystal System:

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

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

By Intensity(I/I_o): 2.798(1)(003), 2.841(0.88)(221,221), 3.158(0.8)(201), 3.425(0.8)(021), 1.3994(0.6)(006), 3.224(0.6)(202), 1.971(0.5)(224), 2.013(0.5)(222), 3.258(0.3)(02<

Forms:

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Crystal Structure:

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Effenberger H , Paar W H , Topa D , Criddle A J , Fleck M , American Mineralogist , 87 (2002) p.753-764, The new mineral baumstarkite and a structural reinvestigation of, aramayoite and miargyrite

Physical Properties of Baumstarkite

Cleavage:

[001] Perfect, [100] Good

Color:

Iron black, Grayish black.

Density:

5.33

Diaphaniety:

Opaque

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Streak:

grayish black

Optical Properties of Baumstarkite

Optical Data:

NCalc= 1.36 - from Gladstone-Dale relationship (KC = 0.0672) where Ncalc=Dcalc*KC+1
NCalc= 1.36 - from Gladstone-Dale relationship (KC = 0.0672) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Strong to weak.

RL Bireflectance:

Weak to moderate.

RL Color:

Gray to white.

RL Pleochroism:

None.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Baumstarkite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	33.15	40.95
420 nm	32.70	40.75
440 nm	32.15	40.20
460 nm	31.60	39.65
480 nm	31.10	39.50
500 nm	30.40	38.80
520 nm	29.95	38.10
540 nm	29.35	37.40
560 nm	28.60	36.80
580 nm	28.10	36.45
600 nm	27.60	35.70
620 nm	27.05	34.65
640 nm	26.45	33.60
660 nm	25.90	32.70
680 nm	25.45	32.40
700 nm	25.15	31.25

**Standardized Intensity (100%) Reflection Spectra of Baumstarkite in Oil**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	19.20	25.95
420 nm	18.40	25.25
440 nm	17.60	24.30
460 nm	17.00	23.80
480 nm	16.40	23.30
500 nm	15.80	22.60
520 nm	15.25	21.80
540 nm	14.70	21.30
560 nm	14.10	20.75
580 nm	13.65	20.50
600 nm	13.20	19.80
620 nm	12.80	18.85
640 nm	12.30	17.90
660 nm	11.95	17.25
680 nm	11.75	16.60
700 nm	11.70	16.30

**Calculated Relative Intensity Colors of Baumstarkite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%
R₁
R₂

**Calculated Relative Intensity Colors of Baumstarkite in Oil**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	660%
R₁
R₂

Calculated Properties of Baumstarkite

Electron Density:

r_electron=4.72 gm/cc
note: r_Baumstarkite=5.32 gm/cc.

Fermion Index

Fermion Index = 0.00165
Boson Index = 0.99835

Photoelectric:

PE_Baumstarkite= 226.23 barns/electron
U=PE_Baumstarkite x r_electron=1,067.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Baumstarkite is Not Radioactive

Baumstarkite Classification

Dana Class:

3.7.4.2 (3)Sulfides - Sulfosalts

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

(3.7.4)Dana Group

3.7.4.1 Aramayoite Ag3Sb2(Sb,Bi)S6 P1 1

3.7.4.2 Baumstarkite ! Ag3(Sb,As)2SbS6 P1 1

Strunz Class:

II/C.16-15 II - Sulfides and sulphosalts

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

II/C.16 - Miargyrite - Volynskite series

II/C.16-05 Cuboargyrite! AgSbS F m3m 4/m 3 2/m

II/C.16-10 Miargyrite AgSbS2 C 2/c 2/m

II/C.16-15 Baumstarkite Ag3(Sb,As)2SbS6 P1 1

II/C.16-20 Aramayoite Ag3Sb2(Sb,Bi)S6 P1 1

II/C.16-30 Matildite AgBiS2 P 3m1 3 2/m

II/C.16-35 Schapbachite! AgBiS2 F m3m 4/m 3 2/m

II/C.16-40 Bohdanowiczite AgBiSe2 P 3m1 3 2/m

II/C.16-50 Volynskite AgBiTe2 P 3m1 3 2/m

Other Baumstarkite Information

References:

NAME( AmMin, Vol 87, p 735) PHYS. PROP.(AmMin, Vol 87, p 735) OPTIC PROP.(AmMin, Vol 87, p 735)

See Also:

Links to other databases for Baumstarkite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Baumstarkite

Ag3(Sb,As)2SbS6
Dana No: 3.7.4.2 Strunz No: II/C.16-15
Locality:

Notes: