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Amarantite Mineral Data

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General Amarantite Information

Help on Chemical  Formula: Chemical Formula: Fe+++(SO4)(OH)•3(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe3+(SO4)(OH)•3(H2O)
Help on Environment: Environment: Secondary mineral formed especially in arid climates.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1888
Help on Locality: Locality: Compania mine, east of Sierra Gorda, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for amaranth, an imaginary purplish red undying flower, for its color.
Help on Name Pronunciation: Name Pronunciation: Amarantite + Pronunciation Say AMARANTITE
Help on Synonym: Synonym: ICSD 9649
  PDF 17-158

Amarantite Image

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

Amarantite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7698:1:0.5743
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.69(1), 11.3(1), 3.57(0.8),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 2 1) ( 0 1 1) ( 1 0 0) ( 0 0 1)

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Physical Properties of Amarantite

Help on Cleavage: Cleavage: {010} Perfect, {100} Perfect
Help on Color: Color: Brown red, Orange red, Pink, Red.
Help on Density: Density: 2.189 - 2.286, Average = 2.23
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow

Optical Properties of Amarantite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.23 gm/cc
note: Specific Gravity of Amarantite =2.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0066690089
Boson Index = 0.9933309911
Help on Photoelectric: Photoelectric: PEAmarantite = 8.16 barns/electron
U=PEAmarantite x rElectron Density= 18.19 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Amarantite is Not Radioactive

Amarantite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.09)where (A+ B++) (XO4) Zq�x(H2O)
  (31.09.03)Dana Group Amarantite Fe(SO4)(OH)•3(H2O) P1 1
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 07.DB.30





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