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.

Name Pronunciation:

Scorodite + Pronunciation

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)

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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

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

Diaphaneity:

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:

Non-fluorescent.

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
Ncalc = 1.75 - 1.8

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.

Calculated Properties of Scorodite

Electron Density:

Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Scorodite =3.28 gm/cc.

Fermion Index:

Fermion Index = 0.0053321348
Boson Index = 0.9946678652

Photoelectric:

PE_Scorodite= 29.23 barns/electron
U=PE_Scorodite x rElectron Density= 92.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Scorodite is Not Radioactive

Scorodite Classification

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

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

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: