Fettelite Mineral Data

General Fettelite Information

Chemical Formula:

[Ag6As2S7][Ag10HgAs2S8]

Composition:

Molecular Weight = 2,720.84 gm

Thallium 0.08 % Tl

Iron 0.02 % Fe

Copper 0.09 % Cu

Silver 63.12 % Ag

Mercury 7.22 % Hg

Antimony 1.57 % Sb

Arsenic 10.05 % As

Lead 0.15 % Pb

Sulfur 17.70 % S

______

100.00 %

Empirical Formula:

Ag_15.92Cu_0.04Pb_0.02Fe²⁺_0.01Tl_0.01Hg_0.98As_3.65Sb_0.35S_15.02

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 Chañarcillo, 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

Sanguinite

Fettelite Image

Images:

Fettelite

Comments: Deep scarlet red crystals of fettelite.
Location: Glasberg Quarry, Nieder-Beerbach, Odenwald, Hesse, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Fettelite Crystallography

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 - SphenoidalH-M Symbol (2) Space Group: C 2

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

By Intensity(I/I_o): 3.091(1)(005), 1.878(0.8)(440), 3.175(0.6)(401),2.998(0.4)(402), 2.755(0.3)(043),

Physical Properties of Fettelite

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

Optical Properties of Fettelite

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

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	∑ R₁(λ)	∑ R₂(λ)
470 nm	22.90	30.40
550 nm	25.20	28.90
580 nm	26.50	26.70
650 nm	29.70	23.70

**Calculated Relative Intensity Colors of Fettelite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	390%
R₁
R₂

Calculated Properties of Fettelite

Electron Density:

Bulk Density (Electron Density)=5.27 gm/cc
note: Specific Gravity of Fettelite =5.93 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Fettelite= 294.36 barns/electron
U=PE_Fettelite x rElectron Density=1,551.43 barns/cc.

Radioactivity:

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

Fettelite Classification

Dana Class:

03.02.06.02 (03)Sulfides - Sulfosalts

(03.02)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.02.06)Dana Group

03.02.06.01 Arcubisite Ag6CuBiS4 Ortho ? Ortho

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

02.L - Unclassified Sulfosalts

02.LA -Without essential Pb

02.LA.30 Fettelite! [Ag6As2S7][Ag10HgAs2S8] C 2 2

Other Fettelite Information

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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Ask about Fettelite here :
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Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Fettelite Specimen Label here :

Fettelite

[Ag6As2S7][Ag10HgAs2S8]
Dana No: 03.02.06.02 Strunz No: 02.LA.30
Locality:

Notes: