Désorite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Désorite
Joy Désor
Formula:
Pb2(Fe3+6Zn)O2(PO4)4(OH)8
Colour:
brownish red
Lustre:
Adamantine
Hardness:
3
Specific Gravity:
4.633 (Calculated)
Crystal System:
Triclinic
Name:
Honours Joy Désor (b. 1990), for his tireless analytical work on mineral unknowns, which has led to the discovery and description of the new minerals ammoniotinsleyite, bojarite, oberwolfachite, oldsite-(K), theuerdankite and hanauerite. Joy did the initial work that suggested that the new mineral described herein could be new. At Joy’s suggestion, the name désorite also honours his noteworthy ancestor Pierre Jean Édouard Désor (13 February 1811, Friedrichsdorf, Grand Duchy of Hesse – 23 February 1882 Nice), a Swiss geologist and professor at Neuchâtel Academy (now the University of Neuchâtel). He was a colleague of Louis Agassiz, among others. His studies on paleontology and glacial phenomena in Europe and North America are of particular note. He was a collaborator on the geological survey of the Lake Superior mineral district in the USA.
Pierre Jean Édouard Désor
Type Locality:
Unique combination of elements (at the upload time).
Name Encoding
ASCII-7:
Desorite
Unique Identifiers
Mindat ID:
470997
Long-form identifier:
mindat:1:1:470997:4
Similar Names
IMA Classification of Désorite
Approved
IMA Formula:
Pb2+2(Fe3+6Zn2+)O2(PO4)4(OH)8
Approval year:
2023
Classification of Désorite
8.BK.25
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
K : With medium-sized and large cations, (OH, etc.):RO4 = 2:1, 2.5:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
K : With medium-sized and large cations, (OH, etc.):RO4 = 2:1, 2.5:1
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 for Standard |
|---|---|---|
| Dso | 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 Désorite
Adamantine
Transparency:
Transparent
Colour:
Brownish red
Streak:
Orange
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
two cleavages: {021} perfect and {001} good.
two cleavages: {021} perfect and {001} good.
Fracture:
Splintery
Comment:
splintery and curved fracture
Density:
4.633 g/cm3 (Calculated)
Optical Data of Désorite
Type:
Biaxial (+)
RI values:
nα = 2.00(1) nβ = 2.02 nγ = 2.10
2V:
Measured: 54° (2)
Max. Birefringence:
δ = 0.100
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 biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Pleochroism:
Strong
Comments:
The mineral is pleochroic: X yellow brown, Y red brown, Z red brown; X < Y ≈ Z.
Comments:
β = 2.02(calc) and γ = 2.10(calc)
Chemistry of Désorite
Mindat Formula:
Pb2(Fe3+6Zn)O2(PO4)4(OH)8
Element Weights:
Crystallography of Désorite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.4389(7) Å, b = 9.324(1) Å, c = 10.093(1) Å
α = 109.024(8)°, β = 90.521(6)°, γ = 97.588(7)°
α = 109.024(8)°, β = 90.521(6)°, γ = 97.588(7)°
Ratio:
a:b:c = 0.583 : 1 : 1.082
Unit Cell V:
478.90 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Irregular blades up to about 0.25 mm long, occurring in subparallel and radial aggregates.
Twinning:
none
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.492 Å | (72) |
| 4.584 Å | (100) |
| 3.687 Å | (59) |
| 3.307 Å | (79) |
| 3.183 Å | (90) |
| 2.850 Å | (79) |
| 2.707 Å | (97) |
| 2.452 Å | (50) |
Type Occurrence of Désorite
General Appearance of Type Material:
Irregular blades up to about 0.25 mm long, occurring in subparallel and radial aggregates.
Place of Conservation of Type Material:
In the collections of Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 76300
Geological Setting of Type Material:
secondary, oxidation-zone mineral assemblage in vugs in a goethite-quartz gossan
Associated Minerals at Type Locality:
Other Language Names for Désorite
Related Minerals - Strunz-mindat Grouping
| 8.BK.05 | Brazilianite | NaAl3(PO4)2(OH)4 |
| 8.BK.10 | Neustädtelite | Bi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4 |
| 8.BK.10 | Cobaltneustädtelite | Bi2Fe3+(Co,Fe3+)(AsO4)2(O,OH)4 |
| 8.BK.10 | Medenbachite | Bi2Fe3+Cu2+(AsO4)2O(OH)3 |
| 8.BK.15 | Curetonite | Ba(Al,Ti)(PO4)(OH,O)F |
| 8.BK.20 | Heyite | Pb5Fe2+2(VO4)2O4 |
| 8.BK.25 | Jamesite | Pb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10 |
| 8.BK.25 | Lulzacite | Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10 |
| 8.BK.30 | Nishanbaevite | KAl2O(AsO4)(SO4) |
| 8.BK.35 | Zircarsite | Na18Cu12ZrO8(AsO4)8Cl6 |
| 8.BK.35 | Arsmirandite | Na18Cu12Fe3+O8(AsO4)8Cl5 |
| 8.BK.35 | Lebedevite | K4Na14Cu14O8(AsO4)8Cl6 |
| 8.BK.35 | Lehmannite | Na18Cu12TiO8(AsO4)8FCl5 |
Fluorescence of Désorite
nonfluorescent in both long- and short-wave ultraviolet illumination
Other Information
Notes:
The mineral is insoluble in room-temperature concentrated HCl.
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 Désorite
mindat.org URL:
https://www.mindat.org/min-470997.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Désorite
Localities for Désorite
Showing 1 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| Bosi et al. (2024) +1 other reference |
Quick NavTopAbout DésoriteName EncodingUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionType Occurrence Other LanguagesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Schöne Aussicht Mine, Dernbach, Wirges, Westerwaldkreis, Rhineland-Palatinate, Germany