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Parascorodite Mineral Data

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General Parascorodite Information

Help on Chemical  Formula: Chemical Formula: Fe+++AsO4•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe3+(AsO4)•2(H2O)
Help on Environment: Environment: Formed as a product of dissolution of arsenopyrite on medieval dumps. A trigonal dimorph of scorodite.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: Kank silver mine in the Kutn� Hora ore district, central Bohemia, Czech Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From Greek. para, near, and scorodite, with which it has a dimorphic relationship.
Help on Synonym: Synonym: IMA1996-061

Parascorodite Image

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

Parascorodite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.11266
Help on Cell Dimensions: Cell Dimensions: a = 8.9327, c = 9.9391, Z = 6; V = 686.82 Den(Calc)= 3.35
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3c1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.076(1), 2.806(0.68), 3.053(0.67),2.661(0.59), 2.52(0.54),

Physical Properties of Parascorodite

Help on Cleavage: Cleavage: {???} Parting
Help on Color: Color: White, Light yellowish brown.
Help on Density: Density: 3.213
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellowish white

Optical Properties of Parascorodite

Help on Gladstone-Dale: 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
Ncalc = 1.78 - 1.81
Help on Optical Data: Optical Data: Uniaxial (+/-), a=1.72, b=1.72, bire=0.0000.

Calculated Properties of Parascorodite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Parascorodite =3.21 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0053321348
Boson Index = 0.9946678652
Help on Photoelectric: Photoelectric: PEParascorodite = 29.23 barns/electron
U=PEParascorodite x rElectron Density= 90.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Parascorodite is Not Radioactive

Parascorodite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 � x(H2O)
  (40.04.09)Dana Group Parascorodite! FeAsO4•2(H2O) P 3c1 3 2/m
Help on  Strunz Class: Strunz Class: 08.CD.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CD -With only medium-sized cations, RO4:H2O = 1:2
08.CD.15 Parascorodite! FeAsO4•2(H2O) P 3c1 3 2/m

Other Parascorodite Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(AmMin, v90, p1469) OPTIC PROP.(MinRec, Vol 31, No 4)
Help on See Also: See Also: Links to other databases for Parascorodite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 08.CD.15





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