Scorodite Mineral Data

Scorodite Mineral Data +

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General Scorodite 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:

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

PDF 37-468

Scorodite Image

Images:

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

Images:

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

Images:

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

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

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

By Intensity(I/I_o): 4.5(1), 3.2(0.8), 5.65(0.8),

Forms:

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Forms: [ 1 1 1] [ 1 0 1] [ 2 0 1] [ 0 0 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

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

Physical Properties of Scorodite

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

Optical Properties of Scorodite

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.

Calculated Properties of Scorodite

Electron Density:

r_electron=3.15 gm/cc
note: r_Scorodite=3.28 gm/cc.

Fermion Index

Fermion Index = 0.00533
Boson Index = 0.99467

Photoelectric:

PE_Scorodite= 29.23 barns/electron
U=PE_Scorodite x r_electron= 92.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Scorodite is Not Radioactive

Scorodite Classification

Dana Class:

40.4.1.3 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.1)Dana Group

40.4.1.1 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m

40.4.1.2 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m

40.4.1.3 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m

40.4.1.4 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m

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

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 Scorodite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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Scorodite

Fe+++AsO4·2(H2O)
Dana No: 40.4.1.3 Strunz No: VII/C.09-80
Locality:

Notes: