Scorodite Mineral Data

Scorodite Mineral Data
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General Scorodite 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: Primary mineral at hydrothermal deposits and secondary mineral in gossens. Forms a series with mansfieldite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1817
Help on Locality: Locality: TL: Unknown. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek skorodon - meaning "garlic" alluding to the arsenic odor when heated.
Help on Name Pronunciation: Name Pronunciation: Scorodite + Pronunciation Say SCORODITE
Help on Synonym: Synonym: ICSD 627
  PDF 37-468
 

Scorodite Image

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Scorodite

Comments: Quartz with an exposed vug lined with lustrous bluish colored crystals of scorodite to 4 mm across.
Location: Hemerdon Mine, Sparkwell, Devon, England. Scale: 5 x 3.6 cm.
© John Veevaert
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Scorodite   Beudantite

Comments: Blue, 2 cm in length scorodite crystals on a sparkling matrix of brilliant brown-black beudantite.
Location: Tsumeb, Namibia. Scale: 8 x 5 x 3 cm.
© John Schneider
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Scorodite

Comments: Color changing scorodite, green (left image) in daylight, red (right image) under indoor lighting.
Location: Ahgbar, Morocco. Scale: NA.
© John Veevaert

Scorodite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.0308:1:0.8935
Help on Cell Dimensions: Cell Dimensions: a = 10.36, b = 10.05, c = 8.98, Z = 8; V = 934.98 Den(Calc)= 3.28
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcab
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.5(1), 3.2(0.8), 5.65(0.8),
Help on Forms: Forms:

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Forms: ( 1 1 1) ( 1 0 1) ( 2 0 1) ( 0 0 1)

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Kitahama K , Kiriyama R , Yoshihisa B , Acta Crystallographica, Section B , 31 (1975) p.322-324, Refinement of the crystal structure of scorodite

 

Physical Properties of Scorodite

Help on Cleavage: Cleavage: {201} Imperfect, {100} Poor, {001} Poor
Help on Color: Color: Yellowish green, Pale leek green, Liver brown, Blue green, Black green.
Help on Density: Density: 3.1 - 3.3, Average = 3.2
Help on Diaphaneity: Diaphaneity: Subtransparent to translucent
Help on Fracture: Fracture: Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: greenish white
 

Optical Properties of Scorodite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.092 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2587,KPDmeas= 0.2652,KC= 0.2427
Ncalc = 1.75 - 1.8
Help on Optical Data: Optical Data: Biaxial (+/-), a=1.784-1.888, b=1.795-1.895, g=1.814-1.915, bire=0.0270-0.0300, 2V(Calc)=62-76, 2V(Meas)=75-62. Dispersion r > v strong.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
 

Calculated Properties of Scorodite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Scorodite =3.28 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0053321348
Boson Index = 0.9946678652
Help on Photoelectric: Photoelectric: PEScorodite = 29.23 barns/electron
U=PEScorodite x rElectron Density= 92.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Scorodite is Not Radioactive
 

Scorodite Classification
Help on Dana Class: Dana Class: 40.04.01.03 (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 · x(H2O)
  (40.04.01)Variscite Group
 
40.04.01.01 Variscite AlPO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.02 Strengite FePO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.03 Scorodite FeAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.04 Mansfieldite AlAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
40.04.01.05 Yanomamite In(AsO4)•2(H2O) P bca 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 08.CD.10 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.10 Strengite FePO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Mansfieldite AlAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Variscite AlPO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Scorodite FeAsO4•2(H2O) Pcab 2/m 2/m 2/m
 
08.CD.10 Yanomamite In(AsO4)•2(H2O) P bca 2/m 2/m 2/m
 

Other Scorodite Information
Help on See Also: See Also: Links to other databases for Scorodite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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

Scorodite

Fe+++AsO4•2(H2O)
Dana No: 40.04.01.03 Strunz No: 08.CD.10
Locality:

 

Notes: