Miargyrite Mineral Data

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General Miargyrite Information

Chemical Formula:

AgSbS2

Composition:

Molecular Weight = 293.75 gm

Silver 36.72 % Ag

Antimony 41.45 % Sb

Sulfur 21.83 % S

______

100.00 %

Empirical Formula:

AgSbS₂

Environment:

In low-temperature hydrothermal silver-bearing sulfide ores.

IMA Status:

Valid Species (Pre-IMA) 1829

Locality:

Braunsdorf, Freiberg, Sachsen (Saxony), Germany. Link to MinDat.org Location Data.

Name Origin:

From the Greek, meyon, "smaller" and argyros, "silver." in allusion to the lessor silver content of the mineral.

Name Pronunciation:

Miargyrite + Pronunciation

Synonym:

ICSD 85130

PDF 19-1137

Miargyrite Image

Images:

Miargyrite

Comments: Metallic miargyrite crystal on quartz.
Location: Braunsdorf, Saxony, Germay. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Miargyrite Aramayoite

Comments: Aramayoite is present as large thin plates (blue iridescence) to 1mm in massive gray miargyrite matrix.
Location: Julcani Silver mine, Huancavelica Dept., Peru. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Miargyrite Crystallography

Axial Ratios:

a:b:c =2.9172:1:3.0122

Cell Dimensions:

a = 12.862, b = 4.409, c = 13.281, Z = 8; beta = 98.48° V = 744.91 Den(Calc)= 5.24

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 2.89(1), 3.45(0.9), 2.75(0.8),

Forms:

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Forms: ( 2 1 3) ( 1 1 1) ( 1 0 1) ( 1 0 1) ( 0 1 0) ( 3 1 1) ( 1 2 4) ( 2 1 1) ( 1 0 0) ( 0 0 1)

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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

View Additional jPOWD Structure files for Miargyrite
[1] [2]

Physical Properties of Miargyrite

Cleavage:

{010} Imperfect

Color:

Steel gray, Lead gray, Blackish red, Reddish gray.

Density:

5.1 - 5.3, Average = 5.19

Diaphaneity:

Translucent to Subopaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

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

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Streak:

cherry red

Optical Properties of Miargyrite

Gladstone-Dale:

CI meas= -4.079 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -4.04 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.334,KPDmeas= 0.3365,KC= 0.0663
Ncalc = 1.34 - 1.35

Optical Data:

Biaxial (+), a=2.72, g=2.78, bire=0.0600

Pleochroism (x):

deep cherry red.

Pleochroism (z):

deep cherry red.

RL Anisotrophism:

Strong.

RL Color:

White with raspberry-red internal reflections in oil, seldom seen in air.

RL Pleochroism:

Distinct, in whites, light gray-whites, and whitish grays.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Miargyrite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	37.30	39.80
420 nm	37.10	40.00
440 nm	36.90	39.45
460 nm	36.50	39.05
480 nm	35.85	38.60
500 nm	34.95	38.05
520 nm	34.05	37.30
540 nm	33.30	36.55
560 nm	32.75	35.90
580 nm	32.10	35.30
600 nm	31.30	34.75
620 nm	30.55	34.00
640 nm	29.90	33.20
660 nm	29.25	32.35
680 nm	28.80	31.85
700 nm	28.60	31.55

**Standardized Intensity (100%) Reflection Spectra of Miargyrite in Oil**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	22.00	24.90
420 nm	21.85	24.95
440 nm	21.55	24.40
460 nm	21.10	23.85
480 nm	20.35	23.35
500 nm	19.45	22.60
520 nm	18.60	21.90
540 nm	17.95	21.20
560 nm	17.40	20.50
580 nm	16.80	19.95
600 nm	16.20	19.50
620 nm	15.50	18.75
640 nm	14.90	18.00
660 nm	14.40	17.30
680 nm	14.05	16.85
700 nm	13.95	16.75

**Calculated Relative Intensity Colors of Miargyrite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	290%
R₁
R₂

**Calculated Relative Intensity Colors of Miargyrite in Oil**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	550%
R₁
R₂

Calculated Properties of Miargyrite

Electron Density:

Bulk Density (Electron Density)=4.64 gm/cc
note: Specific Gravity of Miargyrite =5.24 gm/cc.

Fermion Index:

Fermion Index = 0.0016374117
Boson Index = 0.9983625883

Photoelectric:

PE_Miargyrite= 233.54 barns/electron
U=PE_Miargyrite x rElectron Density=1,083.15 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Miargyrite is Not Radioactive

Miargyrite Classification

Dana Class:

03.07.03.02 (03)Sulfides - Sulfosalts

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

(03.07.03)Dana Group

03.07.03.01 Smithite AgAsS2 A2/a 2/m

03.07.03.02 Miargyrite AgSbS2 C 2/c 2/m

Strunz Class:

02.HA.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HA -With Cu, Ag, Fe (without Pb)

02.HA.10 Miargyrite AgSbS2 C 2/c 2/m

Other Miargyrite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Min, 2nd ed.,1990, AmMin, Vol 87, p 753) OPTIC PROP.(AmMin, Vol 87, p 735)

See Also:

Links to other databases for Miargyrite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Miargyrite

AgSbS2
Dana No: 03.07.03.02 Strunz No: 02.HA.10
Locality:

Notes: