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Saddlebackite Mineral Data
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General Saddlebackite Information
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 Chemical Formula: |
Pb2Bi2Te2S3 |
| Composition: |
Molecular Weight = 1,183.76 gm |
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Bismuth 35.31 % Bi |
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Tellurium 21.56 % Te |
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Lead 35.01 % Pb |
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Sulfur 8.13 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb2Bi2Te2S3 |
| Environment: |
In a lateritic orebody in a greenstone belt. |
| IMA Status: |
Approved IMA 1994 (Dana # Added) |
| Locality: |
Boddington, near Mount Saddleback approximately 100 km SE of Perth, Western Australia. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the Archean-aged Saddleback greenstone belt which hosts the deposit. |
| Name Pronunciation: |
Saddlebackite + Pronunciation  |
| Synonym: |
IMA1994-051 |
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Saddlebackite Image |
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Images:
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Saddlebackite
Comments: BSE image of a saddlebackite grain.
Location: Kockkar' deposit, Plast Town, southern Urals, Russia.
Scale: Scale Bar 300µm.
© Diederik Visser |
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Saddlebackite Crystallography
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| Axial Ratios: |
a:c = 1:7.89598 |
| Cell Dimensions: |
a = 4.23, c = 33.4, Z = 2; V = 517.56 Den(Calc)= 7.60 |
| Crystal System: |
Hexagonal Space Group: Unk |
| X Ray Diffraction: |
By Intensity(I/Io): 3.06(1), 2.115(0.5), 3.35(0.4), |
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Physical Properties of Saddlebackite
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| Cleavage: |
{001} Perfect |
| Color: |
Gray, Black. |
| Diaphaneity: |
Opaque |
| Fracture: |
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite). |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Lamellar - Thin laminae producing a lamellar structure. |
| Hardness: |
2-2.5 - Gypsum-Finger Nail |
| Luster: |
Metallic |
| Streak: |
blackish gray |
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Optical Properties of Saddlebackite
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| RL Anisotrophism: |
Faint, from gray to yellowish-brownish gray. |
| RL Bireflectance: |
Weak. |
| RL Color: |
Grayish white. |
| RL Pleochroism: |
None. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Saddlebackite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
40.40 |
39.30 |
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| 546 nm |
42.10 |
40.80 |
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| 589 nm |
41.30 |
40.80 |
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| 650 nm |
41.90 |
40.90 |
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Calculated Relative Intensity Colors of Saddlebackite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
230% |
| R1 |
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| R2 |
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Calculated Properties of Saddlebackite
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| Electron Density: |
Bulk Density (Electron Density)=6.19 gm/cc
note: Specific Gravity of Saddlebackite =7.60 gm/cc.
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| Fermion Index: |
Fermion Index = 0.09
Boson Index = 0.91 |
| Photoelectric: |
PESaddlebackite =1,439.34 barns/electron
U=PESaddlebackite x rElectron Density=8,908.21 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Saddlebackite is Not Radioactive |
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Saddlebackite Classification
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| Dana Class: |
02.06.07.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.06)where Am Bn Xp, with (m+n):p=4:3 |
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(02.06.07)Dana Group |
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02.06.07.01 Saddlebackite! Pb2Bi2Te2S3 Unk Hex |
| Strunz Class: |
02.GC.40d 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.G - Sulfarsenites, sulfantimonites, sulfbismuthites |
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02.GC -Poly-sulfarsenites |
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02.GC.40d Saddlebackite! Pb2Bi2Te2S3 Unk Hex |
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Other Saddlebackite Information
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| References: |
NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p1118,1998) OPTIC PROP.(Am.Min.,Vol.83,p1118) |
| 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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Print or Cut-and-Paste your Saddlebackite Specimen Label here :
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Saddlebackite
Pb2Bi2Te2S3
Dana No: 02.06.07.01 Strunz No: 02.GC.40d
Locality:
Notes:
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