Saddlebackite
A valid IMA mineral species
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Formula:
Pb2Bi2Te2S3
Colour:
Grey, but often appears black due to specular reflection
Lustre:
Metallic
Hardness:
2 - 2½
Specific Gravity:
7.61 (Calculated)
Crystal System:
Hexagonal
Member of:
Name:
Named after the Saddleback greenstone belt, within which the type locality, Boddington gold deposit, is located.
Aleksite Group.
Chemically similar (or identical?) to UM1995-25-S:BiPbTe, though other properties seem to differ strongly.
Chemically similar (or identical?) to UM1995-25-S:BiPbTe, though other properties seem to differ strongly.
Unique Identifiers
Mindat ID:
7277
Long-form identifier:
mindat:1:1:7277:5
GUID
(UUID V4):
(UUID V4):
f5a5c593-e5c1-482e-b597-c29d925a2972
IMA Classification of Saddlebackite
Approved
First published:
1997
Classification of Saddlebackite
2.GC.40d
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
2.2.7.
2 : SULFIDES
2 : AmBnXp, with (m+n):p = 3:1
2 : SULFIDES
2 : AmBnXp, with (m+n):p = 3:1
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Sdd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Saddlebackite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Saddlebackite
Metallic
Transparency:
Opaque
Colour:
Grey, but often appears black due to specular reflection
Streak:
Blackish
Hardness:
2 - 2½ on Mohs scale
Hardness:
VHN20=42 kg/mm2 - Vickers
Tenacity:
Sectile
Cleavage:
Perfect
0001 cleavage faces.
0001 cleavage faces.
Fracture:
Irregular/Uneven
Density:
7.61 g/cm3 (Calculated)
Optical Data of Saddlebackite
Anisotropism:
Grey to yellowish - brownish grey
Bireflectance:
Weakly
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
400nm | 55.8% | 52.6% |
420nm | 55.8% | 53.0% |
440nm | 55.8% | 53.4% |
460nm | 55.6% | 53.8% |
480nm | 55.2% | 54.1% |
500nm | 54.7% | 54.3% |
520nm | 54.2% | 54.4% |
540nm | 53.5% | 54.5% |
560nm | 52.8% | 54.5% |
580nm | 52.2% | 54.5% |
600nm | 51.8% | 54.4% |
620nm | 51.3% | 54.3% |
640nm | 51.0% | 54.2% |
660nm | 50.7% | 54.1% |
680nm | 50.5% | 53.9% |
700nm | 50.3% | 53.8% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 55.8%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Greyish-white
Internal Reflections:
Slight pinkish tint is sometimes observed due, possibly, to internal reflections
Pleochroism:
Non-pleochroic
Chemistry of Saddlebackite
Mindat Formula:
Pb2Bi2Te2S3
Elements listed:
Crystallography of Saddlebackite
Crystal System:
Hexagonal
Cell Parameters:
a = 4.230(4) Å, c = 33.43(2) Å
Ratio:
a:c = 1 : 7.903
Unit Cell V:
518.02 ų (Calculated from Unit Cell)
Z:
2
Comment:
Satisfactory single crystal X-ray diffraction patterns could not be obtained, possibly due to stacking faults or mechanical deformation of the cleavage fragments.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.379 Å | (100) |
2.572 Å | (80) |
2.597 Å | (55) |
1.862 Å | (45) |
1.849 Å | (20) |
1.650 Å | (20) |
1.636 Å | (20) |
Comments:
Cobalt, Canada. (ICDD 23-88).
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Saddlebackite
General Appearance of Type Material:
Millimetre-sized aggregates, platy or flaky habit.
Place of Conservation of Type Material:
Western Australian Museum in Perth (Catalogue number WAM M1 1997). A representative portion of the hand specimen has also been deposited with the Museum of Victoria, Melbourne (M44644).
Associated Minerals at Type Locality:
Reference:
Clarke, R.M. (1997) Saddlebackite, Pb2Bi2Te2S3, a new mineral species from the Boddinton gold deposit, Western Australia. Australian Journal of Mineralogy: 3: 119-124.
Synonyms of Saddlebackite
Other Language Names for Saddlebackite
German:Saddlebackit
Spanish:Saddlebackita
Relationship of Saddlebackite to other Species
Member of:
Other Members of this group:
Aleksite | PbBi2Te2S2 | Trig. 3m (3 2/m) : P3 1m |
Babkinite | Pb2Bi2(S,Se)3 | Trig. |
Kochkarite | PbBi4Te7 | Trig. |
Poubaite | PbBi2(Se,Te,S)4 | Trig. 3m (3 2/m) : R3m |
Rucklidgeite | PbBi2Te4 | Trig. 3m (3 2/m) : R3m |
Related Minerals - Strunz-mindat Grouping
2.GC. | Clogauite | PbBi4Te4S3 |
2.GC.05 | Hatchite | AgTlPbAs2S5 |
2.GC.05 | Wallisite | (Cu,Ag)TlPbAs2S5 |
2.GC.10 | Sinnerite | Cu6As4S9 |
2.GC.15 | Watanabeite | Cu4(As,Sb)2S5 |
2.GC.20 | Simonite | TlHgAs3S6 |
2.GC.25 | Quadratite | Ag(Cd,Pb)AsS3 |
2.GC.25 | Manganoquadratite | AgMnAsS3 |
2.GC.30 | Smithite | AgAsS2 |
2.GC.35 | Trechmannite | AgAsS2 |
2.GC.35 | Debattistiite | Ag9Hg0.5As6S12Te2 |
2.GC.40a | Aleksite | PbBi2Te2S2 |
2.GC.40b | Kochkarite | PbBi4Te7 |
2.GC.40c | Poubaite | PbBi2(Se,Te,S)4 |
2.GC.40c | Rucklidgeite | PbBi2Te4 |
2.GC.40e | Babkinite | Pb2Bi2(S,Se)3 |
2.GC.45 | Tvalchrelidzeite | Hg3SbAsS3 |
2.GC.50 | Mutnovskite | Pb4As2S6ICl |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Saddlebackite
mindat.org URL:
https://www.mindat.org/min-7277.html
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References for Saddlebackite
Localities for Saddlebackite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Australia (TL) | |
| The Mineralogical Record: 39: 476. +1 other reference |
China | |
| Vikent'ev et al. (2015, June) |
| YIN et al. (2019) |
Kazakhstan | |
| Kovalev et al. (2018) |
Romania | |
| Cook et al. (2005) |
Russia | |
| Kasatkin et al. (2022) |
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