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Parascorodite

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About ParascoroditeHide

Formula:
FeAsO4 · 2H2O
Colour:
White
Lustre:
Vitreous
Hardness:
1 - 2
Specific Gravity:
3.358 (Calculated)
Crystal System:
Trigonal
Name:
From the Greek "para," for "near," and Scorodite, with which it has a dimorphic relationship.
Dimorph of:
The trigonal dimorph of Scorodite. Compare 'UM1979-03-AsO:Fe' and 'UM1979-04-AsO:Fe'.


Classification of ParascoroditeHide

Approved
Approval Year:
1996
8.CD.15

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2

Physical Properties of ParascoroditeHide

Vitreous
Colour:
White
Streak:
Yellowish white
Hardness:
1 - 2 on Mohs scale
Density:
3.358 g/cm3 (Calculated)

Optical Data of ParascoroditeHide

Type:
Uniaxial (+/-)
RI values:
nα = 1.720 nβ = 1.720
Max Birefringence:
δ = 1.720
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of ParascoroditeHide

Formula:
FeAsO4 · 2H2O
IMA Formula:
Fe3+(AsO4) · 2H2O

Crystallography of ParascoroditeHide

Crystal System:
Trigonal
Cell Parameters:
a = 8.9232 Å, c = 9.296 Å
Ratio:
a:c = 1 : 1.042
Unit Cell V:
687.71 ų
Z:
6
Morphology:
Tabular to prismatic hexagonal, tiny /to 1 μm) crystals; may be fan-shaped, in crudely hemispherical aggregates.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.973 (61)
4.184 (44)
4.076 (100)
3.053 (67)
2.806 (68)
2.661 (59)
2.520 (54)

Type Occurrence of ParascoroditeHide

Synonyms of ParascoroditeHide

Other Language Names for ParascoroditeHide

Related Minerals - Nickel-Strunz GroupingHide

8.CD.CastellaroiteMn2+3(AsO4)2·4H2OMon. 2/m
8.CD.05KolbeckiteScPO4 · 2H2OMon. 2/m
8.CD.05MetavarisciteAlPO4 · 2H2OMon. 2/m : P21/b
8.CD.05PhosphosideriteFePO4 · 2H2OMon. 2/m
8.CD.05UM2005-02-AsO:AlHPScSiScAsO4 · 2H2O
8.CD.10MansfielditeAlAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10ScoroditeFe3+AsO4 · 2H2OOrth. mmm (2/m 2/m 2/m)
8.CD.10StrengiteFePO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10VarisciteAlPO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10YanomamiteInAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.20LudlamiteFe2+3(PO4)2 · 4H2OMon. 2/m : P21/b
8.CD.25SterlinghilliteMn3(AsO4)2 · 4H2OTric. 1 : P1
8.CD.30RollanditeCu3(AsO4)2 · 4H2OOrth.

Other InformationHide

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 ParascoroditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1999): 84: 1439-1444.
Perchiazzi, N., Ondruš, P., Skála, R. (2004): Ab-initio X-ray powder structure determination of parascorodite, Fe(H2O)AsO4. European Journal of Mineralogy 16, 1003-1007.

Internet Links for ParascoroditeHide

Localities for ParascoroditeHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic (TL)
 
  • Central Bohemia Region
    • Kutná Hora (Kuttenberg)
AmMin 84:1439-1444; Dobešová, B. (2012). Halda Kaňk: hydrogeochemie pórových vod. Masters Thesis MASARYKOVA UNIVERZITA
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
        • Jáchymov (St Joachimsthal)
Lapis 2002(7/8), 62
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium; Lavreotiki Municipality)
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (I). Mineralien-Welt 25 (1), 60-75 (in German). [identification announced; no description given yet]
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
            • Hilarion area
Rieck, B., Kolitsch, U., Voudouris, P., Giester, G. and Tzeferis, P. (2018): Weitere Neufunde aus Lavrion, Griechenland. Mineralien-Welt 29 (5), 32-77 (in German).
Mineral and/or Locality  
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