Mineralogy Database

Halotrichite Mineral Data

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General Halotrichite Information

Help on Chemical  Formula: Chemical Formula: Fe++Al2(SO4)4•22(H2O)
Help on Composition: Composition: Molecular Weight = 890.40 gm
   Aluminum   6.06 %  Al   11.45 % Al2O3
   Iron       6.27 %  Fe    8.07 % FeO
   Hydrogen   4.98 %  H    44.51 % H2O
   Sulfur    14.41 %  S    35.97 % SO3
   Oxygen    68.28 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Al2(SO4)4•22(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1839
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Latin, halotrichum ="hairy salt."
Help on Name Pronunciation: Name Pronunciation: Halotrichite + Pronunciation Say HALOTRICHITE
Help on Synonym: Synonym: Feather Alum
  Haarsalz
  Iron Alum
 

Halotrichite Image

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  Halotrichite

Comments: White, fibrous halotrichite on rock.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 4.5 cm.
© Thomas Witzke / Abraxas-Verlag

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  Boothite   Halotrichite

Comments: Pale blue earthy boothite with white halotrichite.
Location: Copiapo, Atacama, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Szomolnokite   Halotrichite

Comments: Tan powdery szomolnokite crust on silky fibrous halotrichite with yellow metavoltine.
Location: Markey Mine, Red Canyon, San Juan County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Halotrichite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8445:1:0.2543
Help on Cell Dimensions: Cell Dimensions: a = 20.519, b = 24.297, c = 6.181, Z = 4; beta = 100.9° V = 3,025.94 Den(Calc)= 1.95
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.5(1), 4.3(1), 4.81(1),
Help on Forms: Forms:

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Forms: ( 1 3 1) ( 1 1 0) ( 1 1 1)

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Physical Properties of Halotrichite

Help on Cleavage: Cleavage: {010} Indistinct
Help on Color: Color: Colorless, Green, Gray white, Yellow, White.
Help on Density: Density: 1.78 - 1.9, Average = 1.84
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Silky
Help on Streak: Streak: white
 

Optical Properties of Halotrichite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.039 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2489,KPDmeas= 0.2638,KC= 0.2539
Ncalc = 1.45 - 1.5
Help on Optical Data: Optical Data: Biaxial (-), a=1.48, b=1.486, g=1.49, bire=0.0100, 2V(Calc)=78, 2V(Meas)=35. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Halotrichite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.03 gm/cc
note: Specific Gravity of Halotrichite =1.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0027453011
Boson Index = 0.9972546989
Help on Photoelectric: Photoelectric: PEHalotrichite = 2.92 barns/electron
U=PEHalotrichite x rElectron Density= 5.93 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Halotrichite is Not Radioactive
 

Halotrichite Classification

Help on  Dana Class: Dana Class: 29.07.03.02 (29)Hydrated Acid and Sulfates
  (29.07)where A (B)2 (XO4)4 � x(H2O)
  (29.07.03)Halotrichite Group (Monoclinic with 22 H2O)
 
29.07.03.01 Pickeringite MgAl2(SO4)4•22(H2O) P 2 2
 
29.07.03.02 Halotrichite FeAl2(SO4)4•22(H2O) P 2 2
 
29.07.03.03 Apjohnite MnAl2(SO4)4•22(H2O) P 21/c 2/m
 
29.07.03.04 Dietrichite (Zn,Fe,Mn)Al2(SO4)4•22(H2O) P 21/c 2/m
 
29.07.03.05 Bilinite FeFe2(SO4)4•22(H2O) P 21/c 2/m
 
29.07.03.06 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4•22(H2O) Mono
 
29.07.03.07 Wupatkiite (Co,Mg,Ni)Al2(SO4)4•22(H2O) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 07.CB.85 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CB -With only medium-sized cations
 
07.CB.85 Bilinite FeFe2(SO4)4•22(H2O) P 21/c 2/m
 
07.CB.85 Apjohnite MnAl2(SO4)4•22(H2O) P 21/c 2/m
 
07.CB.85 Dietrichite (Zn,Fe,Mn)Al2(SO4)4•22(H2O) P 21/c 2/m
 
07.CB.85 Halotrichite FeAl2(SO4)4•22(H2O) P 2 2
 
07.CB.85 Pickeringite MgAl2(SO4)4•22(H2O) P 2 2
 
07.CB.85 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4•22(H2O) Mono
 
07.CB.85 Wupatkiite (Co,Mg,Ni)Al2(SO4)4•22(H2O) P 21/c 2/m
 

Other Halotrichite Information

Help on See Also: See Also: Links to other databases for Halotrichite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Dunn)
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info

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

Halotrichite

Fe++Al2(SO4)4•22(H2O)
Dana No: 29.07.03.02 Strunz No: 07.CB.85
Locality:

 

Notes:

 

 


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