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Marrite Mineral Data
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General Marrite Information
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 Chemical Formula: |
PbAgAsS3 |
| Composition: |
Molecular Weight = 486.19 gm |
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Silver 22.19 % Ag |
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Arsenic 15.41 % As |
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Lead 42.62 % Pb |
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Sulfur 19.79 % S |
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______ |
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100.00 % |
| Empirical Formula: |
PbAgAsS3 |
| Environment: |
Of hydrothermal origin with other sulfosalts in dolomite. |
| IMA Status: |
Valid Species (Pre-IMA) 1904 |
| Locality: |
Lengenbach quarry, Binutal, Valais, Switzerland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for John Edward Marr (1857-1933), geologist of Canbridge, England. |
| Name Pronunciation: |
Marrite  |
| Synonym: |
ICSD 26835 |
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PDF 21-1338 |
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Marrite Image |
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Images:
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Marrite
Comments: A prismatic crystal of marrite with small rounded crystals of galena in quartz.
Location: Lengenbach quarry, Binntal, Wallis (Valais), Switzerland.
Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag |
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Images:
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Marrite Jordanite
Comments: Aggregate of gray prismatic crystals of marrite on fine-grained jordanite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland.
Scale: Picture high 5 mm.
© Walter Gabriel |
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Marrite Crystallography
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| Axial Ratios: |
a:b:c =0.575:1:0.473 |
| Cell Dimensions: |
a = 7.291, b = 12.68, c = 5.998, Z = 4; beta = 91.22° V = 554.39 Den(Calc)= 5.82 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a |
| X Ray Diffraction: |
By Intensity(I/Io): 2.75(1), 3.45(1), 3(0.7), |
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Physical Properties of Marrite
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| Cleavage: |
None |
| Color: |
Lead gray, Steel gray. |
| Density: |
6.23 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
| Habit: |
Striated - Parallel lines on crystal surface or cleavage face. |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Hardness: |
3 - Calcite |
| Luster: |
Metallic |
| Streak: |
brownish black |
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Optical Properties of Marrite
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| RL Anisotrophism: |
Distinct, strong in oil. |
| RL Color: |
White, with red internal reflections. |
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Calculated Properties of Marrite
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| Electron Density: |
Bulk Density (Electron Density)=5.03 gm/cc
note: Specific Gravity of Marrite =5.82 gm/cc.
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| Fermion Index: |
Fermion Index = 0.09
Boson Index = 0.91 |
| Photoelectric: |
PEMarrite = 828.56 barns/electron
U=PEMarrite x rElectron Density=4,165.76 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Marrite is Not Radioactive |
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Marrite Classification
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| Dana Class: |
03.04.06.01 (03)Sulfides - Sulfosalts |
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(03.04)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.04.06)Dana Group |
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03.04.06.01 Marrite PbAgAsS3 P 21/a 2/m |
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03.04.06.02 Freieslebenite AgPbSbS3 P 21/n 2/m |
| Strunz Class: |
02.JB.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.J - Sulfosalts of PbS Archetype |
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02.JB -Galena derivatives, with Pb |
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02.JB.15 Freieslebenite AgPbSbS3 P 21/n 2/m |
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02.JB.15 Marrite PbAgAsS3 P 21/a 2/m |
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Other Marrite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Marrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Marrite
PbAgAsS3
Dana No: 03.04.06.01 Strunz No: 02.JB.15
Locality:
Notes:
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