Parascorodite Mineral Data

Parascorodite Mineral Data

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General Parascorodite Information

Chemical Formula:

Fe+++AsO4·2(H2O)

Composition:

Molecular Weight = 230.80 gm

Iron 24.20 % Fe 34.60 % Fe₂O₃

Arsenic 32.46 % As 49.79 % As₂O₅

Hydrogen 1.75 % H 15.61 % H₂O

Oxygen 41.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺(AsO₄)·2(H₂O)

Environment:

Formed as a product of dissolution of arsenopyrite on medieval dumps. A hexagonal or trigonal dimorph of scorodite.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Kank silver mine in the Kutná Hora ore district, central Bohemia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

From Gk. para, near, and scorodite, with which it has a dimorphic relationship.

Synonym:

IMA1996-061

Parascorodite Image

Images:

Parascorodite

Comments: Powdery parascorodite mass.
Location: Kank, near Kutna Hora, Stredocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Parascorodite Crystallography

Axial Ratios:

a:c = 1:1.11266

Cell Dimensions:

a = 8.9327, c = 9.9391, Z = 6; V = 686.82 Den(Calc)= 3.35

Crystal System:

HexagonalSpace Group: HEX ?

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.076(1), 2.806(0.68), 3.053(0.67),2.661(0.59), 2.52(0.54),

Crystal Structure:

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Perchiazzi N , Ondrus P , Skala R , European Journal of Mineralogy , 16 (2004) p.1003-1007, Ab initio X-ray powder structure determination of parascorodite, Fe(H2O)2AsO4

Physical Properties of Parascorodite

Cleavage:

[???] Parting

Color:

White, Light yellowish brown.

Density:

3.213

Diaphaniety:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Vitreous (Glassy)

Streak:

yellowish white

Optical Properties of Parascorodite

Gladstone-Dale:

CI meas= 0.077 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.115 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2149,KPDmeas= 0.2241,KC= 0.2427

Optical Data:

Uniaxial (+/-), a=1.72, b=1.72, bire=0.0000.

Calculated Properties of Parascorodite

Electron Density:

r_electron=3.09 gm/cc
note: r_{Parascorodite}=3.21 gm/cc.

Fermion Index

Fermion Index = 0.00533
Boson Index = 0.99467

Photoelectric:

PE_{Parascorodite}= 29.23 barns/electron
U=PE_{Parascorodite} x r_electron= 90.33 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Parascorodite is Not Radioactive

Parascorodite Classification

Dana Class:

40.4.9.1 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.9)Dana Group

40.4.9.1 Parascorodite ! FeAsO4·2(H2O) HEX ? Hex

Strunz Class:

VII/C.09-88 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.09 - Variscite group

VII/C.09-10 Metavariscite AlPO4·2(H2O) P 2₁/n 2/m

VII/C.09-20 Phosphosiderite FePO4·2(H2O) P 2₁/n 2/m

VII/C.09-30 Kolbeckite ScPO4·2(H2O) P 2₁2₁2₁ 2 2 2

VII/C.09-35 Malhmoodite FeZr(PO4)2·4(H2O) P 2₁/c 2/m

VII/C.09-50 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-60 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-70 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-80 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-85 Yanomamite In(AsO4)·2(H2O) P bca 2/m 2/m 2/m

VII/C.09-88 Parascorodite FeAsO4·2(H2O) HEX ? Hex

VII/C.09-90 Koninckite FePO4·3(H2O)(?) Unk Tetra

Other Parascorodite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(MinRec, Vol 31, N0 4) OPTIC PROP.(MinRec, Vol 31, No 4)

See Also:

Links to other databases for Parascorodite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Parascorodite Specimen Label here :

Parascorodite

Fe+++AsO4·2(H2O)
Dana No: 40.4.9.1 Strunz No: VII/C.09-88
Locality:

Notes: