Amarantite Mineral Data

Amarantite Mineral Data +

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General Amarantite Information

Chemical Formula:

Fe+++(SO4)(OH)·3(H2O)

Composition:

Molecular Weight = 222.96 gm

Iron 25.05 % Fe 35.81 % Fe₂O₃

Hydrogen 3.16 % H 28.28 % H₂O

Sulfur 14.38 % S 35.91 % SO₃

Oxygen 57.41 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺(SO₄)(OH)·3(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1888

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 9649

PDF 17-158

Amarantite Image

Images:

Amarantite

Comments: Amber-like, long, prismatic, bright red amarantite crystals.
Location: Chuquicamata, Antofagasta, Chile. Scale: Crystal size 3 cm.
© Tom Loomis / Dakota Matrix

Amarantite Crystallography

Axial Ratios:

a:b:c =0.7698:1:0.5743

Cell Dimensions:

a = 8.9, b = 11.56, c = 6.64, Z = 4; alpha = 95.635°, beta = 90.985°, gamma = 97.625° V = 673.74 Den(Calc)= 2.20

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 8.69(1), 11.3(1), 3.57(0.8),

Forms:

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

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Crystal Structure:

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Susse P , Zeitschrift fur Kristallographie , 127 (1968) p.261-275, The crystal structure of amarantite, Fe2(SO4)2O*7H2O, Locality: Quetena, Chile

Physical Properties of Amarantite

Cleavage:

[010] Perfect, [100] Perfect

Color:

Brown red, Orange red, Pink, Red.

Density:

2.189 - 2.286, Average = 2.23

Diaphaniety:

Transparent

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

yellow

Optical Properties of Amarantite

Gladstone-Dale:

CI meas= 0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2629,KPDmeas= 0.2585,KC= 0.2725

Optical Data:

Biaxial (-), a=1.516, b=1.598, g=1.621, bire=0.1050, 2V(Calc)=52, 2V(Meas)=30.

Calculated Properties of Amarantite

Electron Density:

r_electron=2.23 gm/cc
note: r_Amarantite=2.20 gm/cc.

Fermion Index

Fermion Index = 0.00666
Boson Index = 0.99334

Photoelectric:

PE_Amarantite= 8.16 barns/electron
U=PE_Amarantite x r_electron= 18.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Amarantite is Not Radioactive

Amarantite Classification

Dana Class:

31.9.3.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.9)where (A+ B++) (XO4) Zq·x(H2O)

(31.9.3)Dana Group

31.9.3.1 Amarantite Fe(SO4)(OH)·3(H2O) P1 1

Strunz Class:

VI/D.01-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.01 - Metahohmannite - Xitieshanite series

VI/D.01-10 Metahohmannite Fe2[O(SO4)2]·4(H2O) P1 1

VI/D.01-20 Butlerite Fe(SO4)(OH)·2(H2O) P 2₁/m 2/m

VI/D.01-30 Parabutlerite Fe(SO4)(OH)·2(H2O) Pmnb 2/m 2/m 2/m

VI/D.01-40 Amarantite Fe(SO4)(OH)·3(H2O) P1 1

VI/D.01-50 Hohmannite Fe2(SO4)2(OH)2·7(H2O) P1 1

VI/D.01-60 Fibroferrite Fe(SO4)(OH)·5(H2O) R 3 3

VI/D.01-70 Xitieshanite Fe(SO4)(OH)·7(H2O) P 2₁/a 2/m

Other Amarantite Information

References:

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

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

Amarantite

Fe+++(SO4)(OH)·3(H2O)
Dana No: 31.9.3.1 Strunz No: VI/D.01-40
Locality:

Notes: