Siderotil Mineral Data

General Siderotil Information

Chemical Formula:

Fe++SO4•5(H2O)

Composition:

Molecular Weight = 241.99 gm

Iron 23.08 % Fe 29.69 % FeO

Hydrogen 4.17 % H 37.22 % H₂O

Sulfur 13.25 % S 33.09 % SO₃

Oxygen 59.51 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺(SO₄)•5(H₂O)

Environment:

Dehydration of cuprian melanterite.

IMA Status:

Valid Species (Pre-IMA) 1891

Locality:

Idrija (Idria), Slovenia. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for iron, sideros, and for fiber, tilos, for its composition and structure.

Name Pronunciation:

Siderotil + Pronunciation

Siderotil Image

Images:

Siderotil

Comments: Siderotil pseudomorphs after melanterite.
Location: 2700' level, Campbell Shaft, Bisbee, Cochise County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Siderotil Crystallography

Axial Ratios:

a:b:c =0.5888:1:0.57

Cell Dimensions:

a = 6.26, b = 10.63, c = 6.06, Z = 2; alpha = 97.25°, beta = 109.67°, gamma = 75° V = 363.85 Den(Calc)= 2.21

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 4.89(1), 3.73(0.8), 5.57(0.6),

Physical Properties of Siderotil

Color:

Yellowish, Yellowish white, White, Light green, Light green white.

Density:

2.1 - 2.2, Average = 2.15

Diaphaneity:

Transparent to Translucent

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Siderotil

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2396,KPDmeas= 0.2441,KC= 0.2409
Ncalc = 1.51 - 1.53

Optical Data:

Biaxial (-), a=1.513-1.515, b=1.525-1.526, g=1.534-1.536, bire=0.0210, 2V(Calc)=80-86, 2V(Meas)=50.

Calculated Properties of Siderotil

Electron Density:

Bulk Density (Electron Density)=2.24 gm/cc
note: Specific Gravity of Siderotil =2.19 gm/cc.

Fermion Index:

Fermion Index = 0.0061783514
Boson Index = 0.9938216486

Photoelectric:

PE_Siderotil= 7.46 barns/electron
U=PE_Siderotil x rElectron Density= 16.75 barns/cc.

Radioactivity:

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

Siderotil Classification

Dana Class:

29.06.07.02 (29)Hydrated Acid and Sulfates

(29.06)where A XO4 ï¿½ x(H2O)

(29.06.07)Chalchanthite Group (Triclinic: P-1)

29.06.07.01 Chalcanthite CuSO4•5(H2O) P1 1

29.06.07.02 Siderotil FeSO4•5(H2O) P1 1

29.06.07.03 Pentahydrite MgSO4•5(H2O) P1 1

29.06.07.04 Jokokuite MnSO4•5(H2O) P1 1

Strunz Class:

07.CB.20 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CB -With only medium-sized cations

07.CB.20 Chalcanthite CuSO4•5(H2O) P1 1

07.CB.20 Jokokuite MnSO4•5(H2O) P1 1

07.CB.20 Pentahydrite MgSO4•5(H2O) P1 1

07.CB.20 Siderotil FeSO4•5(H2O) P1 1

Other Siderotil Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Siderotil :
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
13 - WWW-MINCRYST

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Siderotil

Fe++SO4•5(H2O)
Dana No: 29.06.07.02 Strunz No: 07.CB.20
Locality:

Notes:

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