Halotrichite Mineral Data + Say HALOTRICHITE

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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 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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Halotrichite   Boothite

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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Halotrichite   Szomolnokite

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 - SphenoidalH-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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Lovas G A , Acta Geologica Hungarica , 29 (1986) p.389-398, Structural study of halotrichite from Recsk (Matra Mts., N-Hungary), Locality: Recsk, Matra Mountains, Hungary

 

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 Diaphaniety: Diaphaniety: 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: None.
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
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:

relectron=2.03 gm/cc
note: rHalotrichite =1.95 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00274
Boson Index = 0.99726
Help on Photoelectric: Photoelectric:

PEHalotrichite = 2.92 barns/electron
U=PEHalotrichite x relectron= 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: 29.7.3.2 (29)Hydrated Acid and Sulfates
  (29.7)where A (B)2 (XO4)4 · x(H2O)
  (29.7.3)Halotrichite Group (Monoclinic with 22 H2O)
 
29.7.3.1 Pickeringite MgAl2(SO4)4·22(H2O) P 2 2
 
29.7.3.2 Halotrichite FeAl2(SO4)4·22(H2O) P 2 2
 
29.7.3.3 Apjohnite MnAl2(SO4)4·22(H2O) P 21/c 2/m
 
29.7.3.4 Dietrichite (Zn,Fe,Mn)Al2(SO4)4·22(H2O) P 21/c 2/m
 
29.7.3.5 Bilinite FeFe2(SO4)4·22(H2O) P 21/c 2/m
 
29.7.3.6 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4·22(H2O) Mono
 
29.7.3.7 Wupatkiite (Co,Mg,Ni)Al2(SO4)4·22(H2O) P 21/c 2/m
Help on Strunz Class: Strunz Class: VI/C.12-20 VI - Sulfates,Chromates,Molybdates and Tungstates
  VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size
  VI/C.12 - Halotrichite group, Pickeringite - Bilinite
 
VI/C.12-10 Pickeringite MgAl2(SO4)4·22(H2O) P 2 2
 
VI/C.12-12 Wupatkiite (Co,Mg,Ni)Al2(SO4)4·22(H2O) P 21/c 2/m
 
VI/C.12-20 Halotrichite FeAl2(SO4)4·22(H2O) P 2 2
 
VI/C.12-30 Apjohnite MnAl2(SO4)4·22(H2O) P 21/c 2/m
 
VI/C.12-40 Dietrichite (Zn,Fe,Mn)Al2(SO4)4·22(H2O) P 21/c 2/m
 
VI/C.12-50 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4·22(H2O) Mono
 
VI/C.12-60 Bilinite FeFe2(SO4)4·22(H2O) P 21/c 2/m
 

Other Halotrichite Information
Help on References: References: NAME( Duda&Rejl90) 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 Halotrichite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Franklin Minerals(Dunn) 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (UofA) 11 -MinDAT 12 -MinMax(Deutsch) 13 -MinMax(English) 14 -Mineralienatlas (Deutsch) 15 - Minerals of Wisconsin 16 -QUT Mineral Atlas 17 -École des Mines de Paris

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Halotrichite

Fe++Al2(SO4)4·22(H2O)
Dana No: 29.7.3.2 Strunz No: VI/C.12-20
Locality:

 

Notes:

 
 
   
 
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