Amarantite Mineral Data

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)

Environment:

Secondary mineral formed especially in arid climates.

IMA Status:

Valid Species (Pre-IMA) 1888

Locality:

Compania mine, east of Sierra Gorda, Chile. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for amaranth, an imaginary purplish red undying flower, for its color.

Name Pronunciation:

Amarantite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.6 - 1.62

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:

Bulk Density (Electron Density)=2.23 gm/cc
note: Specific Gravity of Amarantite =2.20 gm/cc.

Fermion Index:

Fermion Index = 0.0066690089
Boson Index = 0.9933309911

Photoelectric:

PE_Amarantite= 8.16 barns/electron
U=PE_Amarantite x rElectron Density= 18.19 barns/cc.

Radioactivity:

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

Amarantite Classification

Dana Class:

31.09.03.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.09)where (A+ B++) (XO4) Zq·x(H2O)

(31.09.03)Dana Group

31.09.03.01 Amarantite Fe(SO4)(OH)•3(H2O) P1 1

Strunz Class:

07.DB.30 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DB -With only medium-sized cations; insular octahedra and finite groups

07.DB.30 Amarantite Fe(SO4)(OH)•3(H2O) P1 1

07.DB.30 Hohmannite Fe2(SO4)2(OH)2•7(H2O) P1 1

07.DB.30 Metahohmannite Fe2[O(SO4)2]•4(H2O) P1 1

Other Amarantite 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 Amarantite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Amarantite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Amarantite

Fe+++(SO4)(OH)•3(H2O)
Dana No: 31.09.03.01 Strunz No: 07.DB.30
Locality:

Notes: