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 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

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

Search for Fettelite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Fettelite :

A Bijoux Google Search for Fettelite
Adam's Minerals Google Search for Fettelite
Cape Minerals Google Search for Fettelite
Dakota Matrix Minerals Google Search for Fettelite
Excalibur Mineral Corp. Google Search for Fettelite
Exceptional Minerals Google Search for Fettelite
John Betts Fine Minerals Search for Fettelite
McDougall Minerals Google Search for Fettelite
Mineral News Website Link
Rock and Mineral Shows Google Search for Fettelite
Weinrich Minerals, Inc. Google Search for Fettelite

Ask about Fettelite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

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: