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Fettelite Mineral Data
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General Fettelite Information
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 Chemical Formula: |
[Ag6As2S7][Ag10HgAs2S8] |
| Composition: |
Molecular Weight = 2,720.84 gm |
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Thallium 0.08 % Tl |
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Iron 0.02 % Fe |
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Copper 0.09 % Cu |
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Silver 63.12 % Ag |
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Mercury 7.22 % Hg |
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Antimony 1.57 % Sb |
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Arsenic 10.05 % As |
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Lead 0.15 % Pb |
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Sulfur 17.70 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag15.92Cu0.04Pb0.02Fe2+0.01Tl0.01Hg0.98As3.65Sb0.35S15.02 |
| Environment: |
Hg-bearing species found in hydrothermal veins cutting basic intrusives of Variscan age. |
| IMA Status: |
Approved IMA 1996 (Dana # Added) |
| Locality: |
Nieder-Beerbach, Darmstadt, Odenwald, Germany and Cha�arcillo, Copiapo Province, Chile (museum specimen). Link to MinDat.org Location Data. |
| Name Origin: |
Named for M. Fettel, an experienced mineral collector who found the mineral. |
| Name Pronunciation: |
Fettelite + Pronunciation  |
| Synonym: |
IMA1994-056 |
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Sanguinite |
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Fettelite Image |
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Images:
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Fettelite Crystallography
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| Axial Ratios: |
a:b:c =1.7284:1:1.0312 |
| Cell Dimensions: |
a = 26.0388, b = 15.0651, c = 15.5361, Z = 8; beta = 90.48° V = 6,094.24 Den(Calc)= 5.93 |
| Crystal System: |
Monoclinic - Sphenoidal H-M Symbol (2) Space Group: C 2 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.091(1)(005), 1.878(0.8)(440), 3.175(0.6)(401),2.998(0.4)(402), 2.755(0.3)(043), |
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Physical Properties of Fettelite
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| Cleavage: |
{0001} Perfect |
| Color: |
Dark violet, Scarlet red. |
| Density: |
6.29 |
| Diaphaneity: |
Subopaque to Opaque |
| Fracture: |
Brittle - Irregular - Very brittle fracture producing irregular fragments |
| Habit: |
Flakes - Flat, thin crystals or aggregates. |
| Habit: |
Hexagonal - Six-sided crystal shape in cross-section or habit. |
| Habit: |
Micaceous - Platy texture with "flexible" plates. |
| Hardness: |
3.5-4 - Copper Penny-Fluorite |
| Luster: |
Adamantine - Metallic |
| Streak: |
vermilion |
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Optical Properties of Fettelite
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| Optical Data: |
NCalc= 1.74 - from Gladstone-Dale relationship (KC = 0.1252) where Ncalc=Dcalc*KC+1
NCalc= 1.79 - from Gladstone-Dale relationship (KC = 0.1252) where Ncalc=Dmeas*KC+1
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| RL Anisotrophism: |
Weak with strong red internal reflections. |
| RL Bireflectance: |
Moderate white to brownish gray. |
| RL Color: |
Grayish white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Fettelite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
22.90 |
30.40 |
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| 550 nm |
25.20 |
28.90 |
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| 580 nm |
26.50 |
26.70 |
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| 650 nm |
29.70 |
23.70 |
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Calculated Relative Intensity Colors of Fettelite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
360% |
390% |
| R1 |
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| R2 |
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Calculated Properties of Fettelite
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| Electron Density: |
Bulk Density (Electron Density)=5.27 gm/cc
note: Specific Gravity of Fettelite =5.93 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEFettelite = 294.36 barns/electron
U=PEFettelite x rElectron Density=1,551.43 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fettelite is Not Radioactive |
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Fettelite Classification
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| Dana Class: |
03.02.06.02 (03)Sulfides - Sulfosalts |
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(03.02)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.02.06)Dana Group |
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03.02.06.01 Arcubisite Ag6CuBiS4 Ortho ? Ortho |
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03.02.06.02 Fettelite! [Ag6As2S7][Ag10HgAs2S8] C 2 2 |
| Strunz Class: |
02.LA.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.L - Unclassified Sulfosalts |
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02.LA -Without essential Pb |
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02.LA.30 Fettelite! [Ag6As2S7][Ag10HgAs2S8] C 2 2 |
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Other Fettelite Information
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| References: |
NAME( Am.Min.,Vol.82,p621,1997) PHYS. PROP.(AmMin v82:621 and v94:609) |
| See Also: |
Links to other databases for Fettelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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Print or Cut-and-Paste your Fettelite Specimen Label here :
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Fettelite
[Ag6As2S7][Ag10HgAs2S8]
Dana No: 03.02.06.02 Strunz No: 02.LA.30
Locality:
Notes:
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