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Paraschoepite

A valid IMA mineral species - grandfathered
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Alfred Schoep
Formula:
UO3 · 2H2O
Colour:
Yellow, greenish-yellow
Lustre:
Adamantine
Hardness:
2 - 3
Specific Gravity:
4.60 (Calculated)
Crystal System:
Orthorhombic
Name:
Named by Schoep, A. & Stradiot, S. (1947) based on its similarity to schoepite, named after mineralogist A. Schoep.
Finch et al. (1997) state "Powder data labeled "paraschoepite" in the Powder Diffraction File do not correspond to the mineral of that name."

Christ and Clark (1960) report a large interplanar distance (c = 15.22 Å) for single crystals of paraschoepite, and state "Because of the distinctive X-ray pattern given by the yellow crystals and the excellent agreement of the optical measurements obtained in the present study with those originally given by Schoep and Stradiot in 1947, there can be little doubt as to the validity of paraschoepite." Subsequent descriptions, however, have considered paraschoepite to be a mixture of metaschoepite, dehydrated schoepite (paulkerrite?), and ianthinite (Brugger et al. 2011; Finch et al. , 1997; with similar large interplanar spacing (a = 14.87 Å) and arrangements found in leesite (Brugger et al. 2011).

Based on recent results of crystal structure studies on schoepite and related minerals, there is no further evidence for paraschoepite to exist (Plášil in prep.).


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Unique IdentifiersHide

Mindat ID:
3110
Long-form identifier:
mindat:1:1:3110:9
GUID
(UUID V4):
1ee2790a-bd85-4d48-9626-a25a816018b5

Classification of ParaschoepiteHide

Approved, 'Grandfathered' (first described prior to 1959)
4.GA.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
A : Without additional cations
5.2.1.2

5 : OXIDES CONTAINING URANIUM OR THORIUM
2 : AXO3·xH2O
7.16.3

7 : Oxides and Hydroxides
16 : Oxides of U

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
PshpIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of ParaschoepiteHide

Adamantine
Transparency:
Translucent
Colour:
Yellow, greenish-yellow
Streak:
yellow
Hardness:
2 - 3 on Mohs scale
Tenacity:
Very brittle
Cleavage:
Perfect
Perfect on {001}; good on {010}
Density:
4.60(13) g/cm3 (Calculated)

Optical Data of ParaschoepiteHide

Type:
Biaxial (-)
RI values:
nα = 1.700 - 1.705 nβ = 1.750 - 1.760 nγ = 1.770
2V:
Measured: 40° , Calculated: 62°
Max Birefringence:
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v strong
Pleochroism:
Visible
Comments:
X = colorless to pale yellow; Y = Z = yellow to golden yellow

Chemical Properties of ParaschoepiteHide

Formula:
UO3 · 2H2O
IMA Formula:
UO3 · (2-x)H2O

Crystallography of ParaschoepiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 14.12(4) Å, b = 16.83(5) Å, c = 15.22(5) Å
Ratio:
a:b:c = 0.839 : 1 : 0.904
Unit Cell V:
3,616.87 ų (Calculated from Unit Cell)
Z:
32

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.09 Å(100)
3.45 Å(25)
3.39 Å(17)
2.89 Å(7)
2.48 Å(7b)
2.542 Å(6)
1.774 Å(6)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47f : [Uranyl (U⁶⁺) minerals]

Type Occurrence of ParaschoepiteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 94712.
Geological Setting of Type Material:
alteration product of schoepite
Associated Minerals at Type Locality:
Reference:
Schoep, A. & Stradiot, S. (1947): Paraschoepite and epiianthinite, two new uranium minerals from Shinkolobwe (Belgian Congo). American Mineralogist 32, 344-350.

Other Language Names for ParaschoepiteHide

Related Minerals - Strunz-mindat GroupingHide

4.GA.05Metaschoepite(UO2)8O2(OH)12 · 10H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
4.GA.05Schoepite(UO2)8O2(OH)12 · 12H2OOrth. mmm (2/m 2/m 2/m) : Pbca
4.GA.10IanthiniteU4+(UO2)5O7 · 10H2OOrth. mm2 : Amm2
4.GA.15MetastudtiteUO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
4.GA.15Studtite[(UO2)(O2)(H2O)2] · H2OMon. 2/m : B2/b
4.GA.20PaulscherreriteUO2(OH)2Mon.
4.GA.25HeisenbergiteUO2(OH) · 2H2O (simplified UO3 · 2H2 O)Orth.

Other InformationHide

Notes:
Radioactive
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ParaschoepiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schoep, A. & Stradiot, S. (1947): Paraschoepite and epiianthinite, two new uranium minerals from Shinkolobwe (Belgian Congo). American Mineralogist 32, 344-350.
Schoep, A. & Stradiot, S. (1948): Crystals of paraschoepite. American Mineralogist 33, 513-514.
American Mineralogist (1960): 45: 1026-1061.
Belova, L. N. & Boyarskaya, R. V. (1979): Two crystalline phases of schoepite or schoepite and paraschoepite? Izv. Akad. Nauk SSSR, Ser. Geol. (7), 140-142 (in Russian).
Finch, R. J., Hawthorne, F. C., Miller, M. L. & Ewing, R. C. (1997): Distinguishing among schoepite, [(UO2)8O2(OH)12](H2O)12, and related minerals by X-ray powder diffraction. Powder Diffraction 12, 230-238.
Brugger, J., Meisser, N., Etschmann, B., Ansermet, S., Pring, A. (2011): Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia: "dehydrated schoepite" is a mineral after all. American Mineralogist 96, 229-240.

Internet Links for ParaschoepiteHide

Localities for ParaschoepiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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.
Czech Republic
 
  • Ústí nad Labem Region
    • Teplice District
      • Moldava
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)]
DR Congo (TL)
 
  • Haut-Katanga
    • Kambove
      • Shinkolobwe
[Am Min 45 (1960), 1026; Nickel & Nichols, 1991, p160 - "Mineral Reference Manual"]
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Ortenaukreis
        • Oberwolfach
KOLITSCH, U. (1997): Ianthinit und weitere Neufunde aus der Grube Clara im mittleren Schwarzwald. - Erzgräber 11 (2), 76-88.
USA
 
  • New Hampshire
    • Sullivan County
      • South Acworth
Dana 8:258
  • New Mexico
    • Socorro County
Minerals of New Mexico 3rd ed.
McLemore, Virginia T., Zimmerer, Matthew, (2009) Magmatic activity and mineralization along the Capitan, Santa Rita, and Morenci lineaments in the Chupadera Mesa area, central New Mexico. New Mexico Geological Society Fall Field Conference Guidebook – 60 Geology of the Chupadera Mesa pp. 375-386
  • North Carolina
Foord,Eugene E.,Korzeb,Stanley L.,Litchte,Frederick E and Fitzpatrick,John J. (1997) Additional studies On Mixed Uranyl Oxide-Hydroxide Hydrate Alteration Products Of Uraninite From The Palermo And Ruggles Granitic Pegmatites,Grafton County,New Hampshire, The Canadian Mineralogist Vol.35 pp.145-151 (1997) pg.146,147,151.
Uzbekistan
 
  • Namangan Region
    • Pop District
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Frost, R. L., Cejka, J., & Dickfos, M. J. (2009). Raman spectroscopic study of the uranyl minerals vanmeersscheite U (OH) 4 [(UO2) 3 (PO4) 2 (OH) 2]. 4H2O and arsenouranylite Ca (UO2)[(UO2) 3 (AsO4) 2 (OH) 2].(OH) 2.6 H2O. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 71(5), 1799-1803.
 
Mineral and/or Locality  
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