Halotrichite Mineral Data

Halotrichite Mineral Data +

[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974

General Halotrichite Information

Chemical Formula:

Fe++Al2(SO4)4·22(H2O)

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

Empirical Formula:

Fe²⁺Al₂(SO₄)₄·22(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1839

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the Latin, halotrichum ="hairy salt."

Synonym:

Feather Alum

Haarsalz

Iron Alum

Halotrichite Image

Images:

Halotrichite

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

Images:

Halotrichite Boothite

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

Images:

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

Axial Ratios:

a:b:c =0.8445:1:0.2543

Cell Dimensions:

a = 20.519, b = 24.297, c = 6.181, Z = 4; beta = 100.9° V = 3,025.94 Den(Calc)= 1.95

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.5(1), 4.3(1), 4.81(1),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: [ 1 3 1] [ 1 1 0] [ 1 1 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Cleavage:

[010] Indistinct

Color:

Colorless, Green, Gray white, Yellow, White.

Density:

1.78 - 1.9, Average = 1.84

Diaphaniety:

Transparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1.5-2 - Talc-Gypsum

Luminescence:

None.

Luster:

Silky

Streak:

white

Optical Properties of Halotrichite

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

Optical Data:

Biaxial (-), a=1.48, b=1.486, g=1.49, bire=0.0100, 2V(Calc)=78, 2V(Meas)=35. Dispersion none.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Halotrichite

Electron Density:

r_electron=2.03 gm/cc
note: r_Halotrichite=1.95 gm/cc.

Fermion Index

Fermion Index = 0.00274
Boson Index = 0.99726

Photoelectric:

PE_Halotrichite= 2.92 barns/electron
U=PE_Halotrichite x r_electron= 5.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Halotrichite is Not Radioactive

Halotrichite Classification

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

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

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Search for Halotrichite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Halotrichite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Halotrichite Mineral Data :

Ask about Halotrichite 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 Halotrichite Specimen Label here :

Halotrichite

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

Notes: