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 X Ray Diffraction: By Intensity(I/I_o): 8.69(1), 11.3(1), 3.57(0.8), Forms:

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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
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

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