Schirmerite Mineral Data

Schirmerite Mineral Data +

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General Schirmerite Information

Chemical Formula:

Ag3Pb3Bi9S18 to Ag3Pb6Bi7S18

Composition:

Molecular Weight = 2,985.26 gm

Silver 10.84 % Ag

Bismuth 49.00 % Bi

Lead 20.82 % Pb

Sulfur 19.33 % S

______

100.00 %

Empirical Formula:

Ag₃Pb₃Bi₇S₁₈

Environment:

Disseminated through quartz.

IMA Status:

Valid Species (Pre-IMA) 1874

Locality:

Treasury lode, Geneva district, Park Co., Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for J. H. L. Schirmer, superintendent of the U. S. Mint, Denver, Colorado, USA.

Schirmerite Image

Images:

Schirmerite

Comments: Gray metallic granular schirmerite in quartz.
Location: Grand Trunk, Geneva District, Park County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Schirmerite Crystallography

Axial Ratios:

a:b:c =0.3029:1:0.0905

Cell Dimensions:

a = 13.45, b = 44.4, c = 4.02, Z = 4; V = 2,400.66 Den(Calc)= 8.26

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Bbmm

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

By Intensity(I/I_o): 2.82(1), 3.27(0.7), 1.961(0.6),

Physical Properties of Schirmerite

Cleavage:

None

Color:

Lead gray, Gray, Iron black.

Density:

6.74

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Optical Properties of Schirmerite

RL Anisotrophism:

Weak in air, distinct to strong in oil, in gray to black.

RL Color:

White.

RL Pleochroism:

Weak in air, weak to distinct in oil.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Schirmerite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	42.60	46.60
420 nm	43.00	47.30
440 nm	43.40	48.00
460 nm	43.60	48.20
480 nm	43.50	48.20
500 nm	43.20	48.00
520 nm	42.90	47.70
540 nm	42.40	47.20
560 nm	42.00	46.70
580 nm	41.70	46.20
600 nm	41.40	46.00
620 nm	41.20	45.70
640 nm	41.10	45.60
660 nm	41.00	45.50
680 nm	40.90	45.30
700 nm	40.90	45.10

**Calculated Relative Intensity Colors of Schirmerite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	220%
R₁
R₂

Calculated Properties of Schirmerite

Electron Density:

r_electron=6.95 gm/cc
note: r_Schirmerite=8.26 gm/cc.

Fermion Index

Fermion Index = 0.04746
Boson Index = 0.95254

Photoelectric:

PE_Schirmerite=1,347.60 barns/electron
U=PE_Schirmerite x r_electron=9,366.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schirmerite is Not Radioactive

Schirmerite Classification

Dana Class:

3.5.5.1 (3)Sulfides - Sulfosalts

(3.5)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.5.5)Dana Group

3.5.5.1 Schirmerite Ag3Pb3Bi9S18toAg3Pb6Bi7S18 Bbmm 2/m 2/m 2/m

Strunz Class:

II/E.31-70 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts (Pb-Cu/Ag) with predominant Vismut x = 6.0 - 1.6

II/E.31 - Xilingolite - Gustavite series

II/E.31-10 Xilingolite Pb3Bi2S6 C 2/m 2/m

II/E.31-20 Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m

II/E.31-30 Bursaite Pb5Bi4S11 Bbmm 2/m 2/m 2/m

II/E.31-40 Ourayite Pb4Ag3Bi5S13 Bbmm 2/m 2/m 2/m

II/E.31-50 Eskimoite Ag7Pb10Bi15S36 Am m

II/E.31-60 Vikingite Ag5Pb8Bi13S30 C 2/m 2/m

II/E.31-70 Schirmerite Ag3Pb3Bi9S18toAg3Pb6Bi7S18 Bbmm 2/m 2/m 2/m

II/E.31-80 Treasurite Ag7Pb6Bi15S32 B2/m 2/m

II/E.31-90 Gustavite PbAgBi3S6(?) Bbmm 2/m 2/m 2/m

Other Schirmerite Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Schirmerite :
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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Schirmerite

Ag3Pb3Bi9S18 to Ag3Pb6Bi7S18
Dana No: 3.5.5.1 Strunz No: II/E.31-70
Locality:

Notes: