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Parascorodite

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Kaňk, Kutná Hora (Kuttenberg), Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic
© 2008, JGW




Formula:
FeAsO
 
4
 · 2H
 
2
O
System:TrigonalColour:White
Lustre:VitreousHardness:1 - 2
Name:From the Greek "para," for "near," and Scorodite, with which it has a dimorphic relationship.
Dimorph of:Scorodite


The trigonal dimorph of Scorodite.

Classification of Parascorodite

IMA status:Approved 1996
Strunz 8th edition ID:7/C.09-88
Nickel-Strunz 10th (pending) edition ID:8.CD.15

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

Type Locality:Kaňk, Kutná Hora (Kuttenberg), Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic

Physical Properties of Parascorodite

Lustre:Vitreous
Colour:White
Streak:Yellowish white
Hardness (Mohs):1 - 2
Density (calculated):3.358 g/cm3

Crystallography of Parascorodite

Crystal System:Trigonal
Cell Parameters:a = 8.9232Å, c = 9.296Å
Ratio:a:c = 1 : 1.042
Unit Cell Volume:V 687.71 ų
Z:6

Optical Data of Parascorodite

Type:Uniaxial (+/-)
RI values: nα = 1.720 nβ = 1.720
Maximum Birefringence:δ = 1.720

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Parascorodite

Formula:
FeAsO
 
4
 · 2H
 
2
O
Essential elements:As, Fe, H, O
All elements listed in formula:As, Fe, H, O

Relationship of Parascorodite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CD.05Kolbeckite
ScPO
 
4
 · 2H
 
2
O
8.CD.05Metavariscite
AlPO
 
4
 · 2H
 
2
O
8.CD.05Phosphosiderite
FePO
 
4
 · 2H
 
2
O
8.CD.05UM2005-02-AsO:AlHPScSi
ScAsO
 
4
 · 2H
 
2
O
8.CD.10Mansfieldite
AlAsO
 
4
 · 2H
 
2
O
8.CD.10Scorodite
FeAsO
 
4
 · 2H
 
2
O
8.CD.10Strengite
FePO
 
4
 · 2H
 
2
O
8.CD.10Variscite
AlPO
 
4
 · 2H
 
2
O
8.CD.10Yanomamite
InAsO
 
4
 · 2H
 
2
O
8.CD.20Ludlamite
(Fe,Mn,Mg)
 
3
(PO
 
4
)
 
2
 · 4H
 
2
O
8.CD.25Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
 · 4H
 
2
O
8.CD.30Rollandite
Cu
 
3
(AsO
 
4
)
 
2
 · 4H
 
2
O

Other Names for Parascorodite

Synonyms:
IMA1996-061Paraskorodite
Other Languages:
German:Parascorodit
Paraskorodit
Russian:Параскородит
Spanish:Parascorodita
Paraskorodita

Other Information

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

References for Parascorodite

Reference List:

- +
American Mineralogist (1999): 84: 1439-1444.

European Journal of Mineralogy (2004): 16: 1003-1007.

Internet Links for Parascorodite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Parascorodite details from Handbook of Mineralogy (PDF)
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    • Localities for Parascorodite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Central Bohemia Region
        • Kutná Hora (Kuttenberg)
    		AmMin 84:1439-1444
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov (St Joachimsthal) District
            • Jáchymov (St Joachimsthal)
    		Lapis 2002(7/8), 62
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