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Jeanbandyite
A valid IMA mineral species
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About Jeanbandyite
Formula:
Fe3+Sn(OH)5O
Colour:
Brownish orange, yellowish, reddish
Hardness:
3½
Specific Gravity:
3.81
Crystal System:
Tetragonal
Name:
Honouring Mrs. Jean A. Bandy (1900-1991), of Wickenburg, Arizona, USA, who donated to the Los Angeles Natural History Museum the collection on one of whose specimens this new mineral was discovered. The mineral bandylite was named for her husband.
Closely related to natanite.
Oxidised counterpart of natanite with partially deprotonated oxygen sites. Double perovskite of BB'(OH)6 type. The deprotonated domains have local short-range order.
A dark violet and hard mineral of the (Fe,Mn)(Sn,Ge)(OH)6 composition is reported as "Mineral D" and the Sn-analogue of stottite, from Tsumeb, Namibia (Geier & Ottemann, 1970).
Oxidised counterpart of natanite with partially deprotonated oxygen sites. Double perovskite of BB'(OH)6 type. The deprotonated domains have local short-range order.
A dark violet and hard mineral of the (Fe,Mn)(Sn,Ge)(OH)6 composition is reported as "Mineral D" and the Sn-analogue of stottite, from Tsumeb, Namibia (Geier & Ottemann, 1970).
Unique Identifiers
Mindat ID:
2084
Long-form identifier:
mindat:1:1:2084:4
IMA Classification of Jeanbandyite
Classification of Jeanbandyite
4.FC.15
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
C : Hydroxides with OH, without H2O; corner-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
C : Hydroxides with OH, without H2O; corner-sharing octahedra
6.3.7.3
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
3 : X(OH)3
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
3 : X(OH)3
7.11.9
7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
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 for Standard |
|---|---|---|
| Jbd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Jeanbandyite
Colour:
Brownish orange, yellowish, reddish
Streak:
Brownish yellow
Hardness:
3½ on Mohs scale
Comment:
ca. 3.5
Cleavage:
Imperfect/Fair
{001} and {100}
{001} and {100}
Density:
3.81(5) g/cm3 (Measured) 3.81 g/cm3 (Calculated)
Optical Data of Jeanbandyite
Type:
Uniaxial (-)
RI values:
nω = 1.837 nε = 1.833
Max. Birefringence:
δ = 0.004
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Jeanbandyite
Mindat Formula:
Fe3+Sn(OH)5O
Element Weights:
Elements listed:
Common Impurities:
Mn,(Mg,Si)
Crystallography of Jeanbandyite
Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
P42/n
Cell Parameters:
a = 7.64 Å, c = 7.64 Å
Ratio:
a:c = 1 : 1
Unit Cell V:
445.94 ų (Calculated from Unit Cell)
Z:
4
Comment:
New refinement gives cubic cell, space group Pn-3, a=7.6427 or 7.658; on the other hand the stoichiometry (see the current formula) does not fit to such structure
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
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Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
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2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0013052 | Jeanbandyite | Morgenstern-Badarau I, Michel A (1976) Sur l'existence d'un oxyhydroxyde double de fer(III) et d'etain(IV) Journal of Inorganic and Nuclear Chemistry 38 1400-1402 | 1976 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.83 Å | (100) |
| 2.71 Å | (70) |
| 1.71 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Jeanbandyite
Place of Conservation of Type Material:
Los Angeles County Natural History Museum (California)
Geological Setting of Type Material:
Telescoped hydrothermal tin mineralization in a highly altered acid igneous stock.
Associated Minerals at Type Locality:
Synonyms of Jeanbandyite
Other Language Names for Jeanbandyite
Relationship of Jeanbandyite to other Species
Other Members of Schoenfliesite Subgroup:
| Burtite | Ca[Sn(OH)6] | Hex. |
| Mushistonite | (Cu,Zn,Fe2+)[Sn(OH)6] | Orth. mmm(2/m2/m2/m) : Pnnn |
| Natanite | Fe2+[Sn(OH)6] | Iso. m3m(4/m32/m) : Pn3m |
| Schoenfliesite | Mg[Sn(OH)6] | Iso. m3(2/m3) : Pn3 |
| Vismirnovite | Zn[Sn(OH)6] | Iso. m3m(4/m32/m) : Pn3m |
| Wickmanite | Mn2+[Sn(OH)6] | Iso. m3(2/m3) : Pn3 |
Common Associates
Associations Based on Photo Data:
| 7 photos of Jeanbandyite associated with Dzhalindite | In(OH)3 |
Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia