Mineralogy Database

Saddlebackite Mineral Data

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General Saddlebackite Information

Help on Chemical  Formula: Chemical Formula: Pb2Bi2Te2S3
Help on Composition: Composition: Molecular Weight = 1,183.76 gm
   Bismuth    35.31 %  Bi
   Tellurium  21.56 %  Te
   Lead       35.01 %  Pb
   Sulfur      8.13 %  S
             100.00 % 
Help on Empirical Formula: Empirical Formula: Pb2Bi2Te2S3
Help on Environment: Environment: In a lateritic orebody in a greenstone belt.
Help on IMA Status: IMA Status: Approved IMA 1994 (Dana # Added)
Help on Locality: Locality: Boddington, near Mount Saddleback approximately 100 km SE of Perth, Western Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Archean-aged Saddleback greenstone belt which hosts the deposit.
Help on Name Pronunciation: Name Pronunciation: Saddlebackite + Pronunciation Say SADDLEBACKITE
Help on Synonym: Synonym: IMA1994-051

Saddlebackite Image

Click Here for Larger   Image in a New Browser Window Images:
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Comments: BSE image of a saddlebackite grain.
Location: Kockkar' deposit, Plast Town, southern Urals, Russia. Scale: Scale Bar 300µm.
© Diederik Visser

Saddlebackite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:7.89598
Help on Cell Dimensions: Cell Dimensions: a = 4.23, c = 33.4, Z = 2; V = 517.56 Den(Calc)= 7.60
Help on Crystal System: Crystal System: Hexagonal Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1), 2.115(0.5), 3.35(0.4),

Physical Properties of Saddlebackite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Gray, Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: blackish gray

Optical Properties of Saddlebackite

Help on RL Anisotrophism: RL Anisotrophism: Faint, from gray to yellowish-brownish gray.
Help on RL Bireflectance: RL Bireflectance: Weak.
Help on RL Color: RL Color: Grayish white.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Saddlebackite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   40.40   39.30 
 546 nm   42.10   40.80 
 589 nm   41.30   40.80 
 650 nm   41.90   40.90 
Calculated Relative Intensity Colors of Saddlebackite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 230%

Calculated Properties of Saddlebackite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.19 gm/cc
note: Specific Gravity of Saddlebackite =7.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PESaddlebackite =1,439.34 barns/electron
U=PESaddlebackite x rElectron Density=8,908.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Saddlebackite is Not Radioactive

Saddlebackite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.06)where Am Bn Xp, with (m+n):p=4:3
  (02.06.07)Dana Group Saddlebackite! Pb2Bi2Te2S3 Unk Hex
Help on  Strunz Class: Strunz Class: 02.GC.40d 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.G - Sulfarsenites, sulfantimonites, sulfbismuthites
  02.GC -Poly-sulfarsenites
02.GC.40d Saddlebackite! Pb2Bi2Te2S3 Unk Hex

Other Saddlebackite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p1118,1998) OPTIC PROP.(Am.Min.,Vol.83,p1118)
Help on See Also: See Also: Links to other databases for Saddlebackite :
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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Dana No: Strunz No: 02.GC.40d





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