Saddlebackite Mineral Data

Saddlebackite Mineral Data +

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General Saddlebackite Information

Chemical Formula:

Pb2Bi2Te2S3

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 %

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.

Synonym:

IMA1994-051

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Saddlebackite Crystallography

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:

HexagonalSpace Group: Unk

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

By Intensity(I/I_o): 3.06(1), 2.115(0.5), 3.35(0.4),

Physical Properties of Saddlebackite

Cleavage:

[001] Perfect

Color:

Gray, Black.

Diaphaniety:

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

Optical Properties of Saddlebackite

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	∑ 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**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	230%
R₁
R₂

Calculated Properties of Saddlebackite

Electron Density:

r_electron=6.19 gm/cc
note: r_{Saddlebackite}=7.60 gm/cc.

Fermion Index

Fermion Index = 0.0952
Boson Index = 0.9048

Photoelectric:

PE_{Saddlebackite}=1,439.34 barns/electron
U=PE_{Saddlebackite} x r_electron=8,908.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Saddlebackite is Not Radioactive

Saddlebackite Classification

Dana Class:

2.6.7.1 (2)Sulfides - Including Selenides and Tellurides

(2.6)where Am Bn Xp, with (m+n):p=4:3

(2.6.7)Dana Group

2.6.7.1 Saddlebackite ! Pb2Bi2Te2S3 Unk Hex

Strunz Class:

II/D.12-55 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.12 - Tetradymite group, Poubaite - Rucklidgeite series

II/D.12-10 Kochkarite PbBi4Te7 P 3m1 3 2/m

II/D.12-20 Aleksite PbBi2Te2S2(?) P 3m1 3 2/m

II/D.12-30 Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m

II/D.12-40 Platynite? (Bi,Pb)3(Se,S)4 R 3m 3 2/m

II/D.12-50 Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m

II/D.12-55 Saddlebackite Pb2Bi2Te2S3 Unk Hex

II/D.12-60 Babkinite! Pb2Bi2(S,Se)3 P 3,P 3m Trig

Other Saddlebackite Information

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 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Print or Cut-and-Paste your Saddlebackite Specimen Label here :

Saddlebackite

Pb2Bi2Te2S3
Dana No: 2.6.7.1 Strunz No: II/D.12-55
Locality:

Notes: