General Scorodite Information
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Chemical Formula: |
Fe+++AsO4·2(H2O) |
Composition: |
Molecular Weight = 230.80 gm |
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Iron 24.20 % Fe 34.60 % Fe2O3 |
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Arsenic 32.46 % As 49.79 % As2O5 |
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Hydrogen 1.75 % H 15.61 % H2O |
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Oxygen 41.59 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Fe3+(AsO4)·2(H2O) |
Environment: |
Primary mineral at hydrothermal deposits and secondary mineral in gossens. Forms a series with mansfieldite. |
IMA Status: |
Valid Species (Pre-IMA) 1817 |
Locality: |
TL: Unknown. Link to MinDat.org Location Data. |
Name Origin: |
From the Greek skorodon - meaning "garlic" alluding to the arsenic odor when heated. |
Synonym: |
ICSD 627 |
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PDF 37-468 |
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Scorodite Image |
Images:
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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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Images:
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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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Images:
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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 |
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Scorodite Crystallography
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Axial Ratios: |
a:b:c =1.0308:1:0.8935 |
Cell Dimensions: |
a = 10.36, b = 10.05, c = 8.98, Z = 8; V = 934.98 Den(Calc)= 3.28 |
Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcab |
X Ray Diffraction: |
By Intensity(I/Io): 4.5(1), 3.2(0.8), 5.65(0.8), |
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Crystal Structure:
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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
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Physical Properties of Scorodite
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Cleavage: |
[201] Imperfect, [100] Poor, [001] Poor |
Color: |
Yellowish green, Pale leek green, Liver brown, Blue green, Black green. |
Density: |
3.1 - 3.3, Average = 3.2 |
Diaphaniety: |
Subtransparent to translucent |
Fracture: |
Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende). |
Habit: |
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). |
Habit: |
Fibrous - Crystals made up of fibers. |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Hardness: |
3.5-4 - Copper Penny-Fluorite |
Luminescence: |
None. |
Luster: |
Vitreous - Greasy |
Streak: |
greenish white |
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Optical Properties of Scorodite
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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 |
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. |
Pleochroism (x): |
none. |
Pleochroism (y): |
none. |
Pleochroism (z): |
faint. |
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Calculated Properties of Scorodite
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Electron Density: |
relectron=3.15 gm/cc note: rScorodite =3.28 gm/cc. |
Fermion Index |
Fermion Index = 0.00533 Boson Index = 0.99467 |
Photoelectric: |
PEScorodite = 29.23 barns/electron U=PEScorodite x relectron= 92.21 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Scorodite is Not Radioactive |
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Scorodite Classification
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Dana Class: |
40.4.1.3 (40)Hydrated Phosphates, etc |
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(40.4)where A+++ XO4 · x(H2O) |
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(40.4.1)Dana Group |
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40.4.1.1 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m |
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40.4.1.2 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m |
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40.4.1.3 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m |
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40.4.1.4 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m |
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40.4.1.5 Yanomamite In(AsO4)·2(H2O) P bca 2/m 2/m 2/m |
Strunz Class: |
VII/C.09-80 VII - Phosphates, Arsenates and Vanadates |
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VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg |
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VII/C.09 - Variscite group |
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VII/C.09-10 Metavariscite AlPO4·2(H2O) P 21/n 2/m |
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VII/C.09-20 Phosphosiderite FePO4·2(H2O) P 21/n 2/m |
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VII/C.09-30 Kolbeckite ScPO4·2(H2O) P 212121 2 2 2 |
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VII/C.09-35 Malhmoodite FeZr(PO4)2·4(H2O) P 21/c 2/m |
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VII/C.09-50 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m |
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VII/C.09-60 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m |
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VII/C.09-70 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m |
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VII/C.09-80 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m |
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VII/C.09-85 Yanomamite In(AsO4)·2(H2O) P bca 2/m 2/m 2/m |
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VII/C.09-88 Parascorodite! FeAsO4·2(H2O) HEX ? Hex |
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VII/C.09-90 Koninckite FePO4·3(H2O)(?) Unk Tetra |
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Other Scorodite Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Scorodite :
1 -Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 -Athena
4 - Crocoite.com Mineral Locations
5 - EUROmin Project
6 - Franklin Minerals(Dunn)
7 -Google Images
8 -Google Scholar
9 -Handbook of Mineralogy (UofA)
10 - HyperPhysics
11 -MinDAT
12 -MinMax(Deutsch)
13 -MinMax(English)
14 -Mineralienatlas (Deutsch)
15 -QUT Mineral Atlas
16 - WWW-MINCRYST
17 -École des Mines de Paris
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Scorodite
Fe+++AsO4·2(H2O)
Dana No: 40.4.1.3 Strunz No: VII/C.09-80
Locality:
Notes:
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