Désorite
A valid IMA mineral species
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About Désorite
Joy Desor
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, 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).
Unique Identifiers
Mindat ID:
470997
Long-form identifier:
mindat:1:1:470997:4
GUID
(UUID V4):
(UUID V4):
80df997c-db08-48cc-a381-dd2dfeeb6ce7
IMA Classification of Désorite
Approved
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 |
|---|---|---|
| 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 = 2.000(1) nβ = 2.020 nγ = 2.100
2V:
Measured: 54° (2)
Max Birefringence:
δ = 0.100
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
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
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:
Related Minerals - Strunz-mindat Grouping
| 8.BK.05 | Brazilianite | NaAl3(PO4)2(OH)4 |
| 8.BK.10 | Medenbachite | Bi2Fe3+Cu2+(AsO4)2O(OH)3 |
| 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.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 | Arsmirandite | Na18Cu12Fe3+O8(AsO4)8Cl5 |
| 8.BK.35 | Lehmannite | Na18Cu12TiO8(AsO4)8FCl5 |
| 8.BK.35 | Lebedevite | K4Na14Cu14O8(AsO4)8Cl6 |
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
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References for Désorite
Reference List:
Localities for Désorite
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) | |
| Kampf et al. (2024) +1 other reference |
Schöne Aussicht Mine, Dernbach, Wirges, Westerwaldkreis, Rhineland-Palatinate, Germany