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Halotrichite

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Formula:
FeAl2(SO4)4 · 22H2O
Colour:
Colourless to white, yellowish, greenish; colourless in transmitted light.
Lustre:
Silky
Hardness:
1½ - 2
Specific Gravity:
1.89
Crystal System:
Monoclinic
Name:
Named in 1839 by Ernst Friedrich Glocker from the Greek αλζ meaning salt and τρικοζ meaning hair. Latin form is "halotrichum," which in turn is from the older German name "Haarsalz" (hair salt).
Halotrichite Group; Halotrichite-Pickeringite Series.
Fe(II) analogue of Pickeringite.

At least a partial series extends toward Apjohnite.



Classification of Halotrichite

Approved, 'Grandfathered' (first described prior to 1959)
7.CB.85

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations
29.7.3.2

29 : HYDRATED ACID AND NORMAL SULFATES
7 : AB2(XO4)4·H2O
25.11.26

25 : Sulphates
11 : Sulphates of Fe and other metals

Physical Properties of Halotrichite

Silky
Transparency:
Transparent, Translucent
Colour:
Colourless to white, yellowish, greenish; colourless in transmitted light.
Streak:
White
Hardness:
1½ - 2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
On {010}, poor.
Fracture:
Conchoidal
Density:
1.89 g/cm3 (Measured)    1.95 g/cm3 (Calculated)
Comment:
Pure end member values.

Optical Data of Halotrichite

Type:
Biaxial (-)
RI values:
nα = 1.480 nβ = 1.486 nγ = 1.490
2V:
Measured: 35° , Calculated: 78°
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of Halotrichite

Formula:
FeAl2(SO4)4 · 22H2O
IMA Formula:
Fe2+Al2(SO4)4 · 22H2O

Crystallography of Halotrichite

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P2
Cell Parameters:
a = 20.51 Å, b = 24.29 Å, c = 6.18 Å
β = 100.99°
Ratio:
a:b:c = 0.844 : 1 : 0.254
Unit Cell V:
3,022.34 ų (Calculated from Unit Cell)
Morphology:
Crystals acicular [001]; distinctly terminated crystals rare. Radial or matted aggregates of hair-like crystals; tufted; spheroidal; as incrustations or efflorescences; asbestiform. Larger crystals may be hollow or contain bubbles of liquid or gas.

X-Ray Powder Diffraction

Powder Diffraction Data:
d-spacingIntensity
6.02 (35)
4.93 (21)
4.78 (100)
4.29 (31)
3.947 (21)
3.751 (27)
3.484 (75)

Synonyms of Halotrichite

Other Language Names for Halotrichite

Varieties of Halotrichite

Bergbutter

A pale yellow crust or tuberose efflorescence found on slate or shale. Noted for a greasy feel when rubbed.

Masrite

A manganoan and cobaltoan variety of Halotrichite.

Originally reported from Egypt.

Relationship of Halotrichite to other Species

Other Members of this group:
ApjohniteMn2+Al2(SO4)4 · 22H2O
BíliniteFe2+Fe3+2(SO4)4 · 22H2O
Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2O
PickeringiteMgAl2(SO4)4 · 22H2O
Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4·22H2O
Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2O
Forms a series with:

Common Associates

Associated Minerals Based on Photo Data:
Voltaite28 photos of Halotrichite associated with Voltaite on mindat.org.
Römerite27 photos of Halotrichite associated with Römerite on mindat.org.
Botryogen23 photos of Halotrichite associated with Botryogen on mindat.org.
Copiapite17 photos of Halotrichite associated with Copiapite on mindat.org.
Coquimbite13 photos of Halotrichite associated with Coquimbite on mindat.org.
Melanterite10 photos of Halotrichite associated with Melanterite on mindat.org.
Alunogen7 photos of Halotrichite associated with Alunogen on mindat.org.
Cuprian Melanterite7 photos of Halotrichite associated with Cuprian Melanterite on mindat.org.
Pyrite6 photos of Halotrichite associated with Pyrite on mindat.org.
Parabutlerite6 photos of Halotrichite associated with Parabutlerite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

7.CB.05Dwornikite(Ni,Fe)SO4 · H2O
7.CB.05GunningiteZnSO4 · H2O
7.CB.05KieseriteMgSO4 · H2O
7.CB.05Poitevinite(Cu,Fe,Zn)SO4 · H2O
7.CB.05SzmikiteMnSO4 · H2O
7.CB.05SzomolnokiteFeSO4 · H2O
7.CB.05CobaltkieseriteCoSO4 · H2O
7.CB.07SanderiteMgSO4 · 2H2O
7.CB.10BonattiteCuSO4 · 3H2O
7.CB.15Aplowite(Co,Mn,Ni)SO4 · 4H2O
7.CB.15Boyleite(Zn,Mg)SO4 · 4H2O
7.CB.15Ilesite(Mn,Zn,Fe)SO4 · 4H2O
7.CB.15RozeniteFeSO4 · 4H2O
7.CB.15StarkeyiteMgSO4 · 4H2O
7.CB.15DrobeciteCdSO4 · 4H2O
7.CB.15CranswickiteMgSO4 · 4H2O
7.CB.20ChalcanthiteCuSO4 · 5H2O
7.CB.20JôkokuiteMnSO4 · 5H2O
7.CB.20PentahydriteMgSO4 · 5H2O
7.CB.20SiderotilFeSO4 · 5H2O
7.CB.25Bianchite(Zn,Fe)SO4 · 6H2O
7.CB.25Chvaleticeite(Mn,Mg)SO4 · 6H2O
7.CB.25FerrohexahydriteFeSO4 · 6H2O
7.CB.25HexahydriteMgSO4 · 6H2O
7.CB.25Moorhouseite(Co,Ni,Mn)SO4 · 6H2O
7.CB.25Nickelhexahydrite(Ni,Mg,Fe)SO4 · 6H2O
7.CB.30RetgersiteNiSO4 · 6H2O
7.CB.35BieberiteCoSO4 · 7H2O
7.CB.35BoothiteCuSO4 · 7H2O
7.CB.35MallarditeMnSO4 · 7H2O
7.CB.35MelanteriteFeSO4 · 7H2O
7.CB.35Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2O
7.CB.35Alpersite(Mg,Cu)[SO4] · 7H2O
7.CB.40EpsomiteMgSO4 · 7H2O
7.CB.40GoslariteZnSO4 · 7H2O
7.CB.40MorenositeNiSO4 · 7H2O
7.CB.45AlunogenAl2(SO4)3 · 17H2O
7.CB.45Meta-alunogenAl2(SO4)3 · 12H2O
7.CB.50AluminocoquimbiteFeAl(SO4)3 · 9H2O
7.CB.55CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
7.CB.55ParacoquimbiteFe2(SO4)3 · 9H2O
7.CB.55Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2O
7.CB.60KorneliteFe2(SO4)3 · 7H2O
7.CB.65QuenstedtiteFe2(SO4)3 · 11H2O
7.CB.70LauseniteFe2(SO4)3·5H2O
7.CB.75LishizheniteZnFe2(SO4)4 · 14H2O
7.CB.75RömeriteFe2+Fe3+2(SO4)4 · 14H2O
7.CB.80RansomiteCuFe2(SO4)4 · 6H2O
7.CB.85ApjohniteMn2+Al2(SO4)4 · 22H2O
7.CB.85BíliniteFe2+Fe3+2(SO4)4 · 22H2O
7.CB.85Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2O
7.CB.85PickeringiteMgAl2(SO4)4 · 22H2O
7.CB.85Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4·22H2O
7.CB.85Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2O
7.CB.90MeridianiiteMgSO4 · 11H2O

Related Minerals - Hey's Chemical Index of Minerals Grouping

25.11.1NatrojarositeNaFe3(SO4)2(OH)6
25.11.2SideronatriteNa2Fe(SO4)2(OH) · 3H2O
25.11.3MetasideronatriteNa2Fe(SO4)2(OH) · H2O
25.11.4FerrinatriteNa3Fe(SO4)3 · 3H2O
25.11.5AmarilliteNaFe(SO4)2 · 6H2O
25.11.6YavapaiiteKFe(SO4)2
25.11.7KrausiteKFe(SO4)2 · H2O
25.11.8GoldichiteKFe(SO4)2 · 4H2O
25.11.9JarositeKFe3+ 3(SO4)2(OH)6
25.11.10VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2O
25.11.11UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2O
25.11.12MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
25.11.13Sabieite(NH4)Fe3+(SO4)2
25.11.14Ammoniojarosite(NH4)Fe3+3(SO4)2(OH)6
25.11.15Clairite(NH4)2Fe3(SO4)4(OH)3 · 3H2O
25.11.16Mohrite(NH4)2Fe(SO4)2 · 6H2O
25.11.17Lonecreekite(NH4)Fe3+(SO4)2 · 12H2O
25.11.18Godovikovite(NH4)Al(SO4)2
25.11.19BotryogenMgFe3+(SO4)2(OH) · 7H2O
25.11.21Slavíkite(H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2O
25.11.23SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2O
25.11.24Millosevichite(Al,Fe)2(SO4)3
25.11.25AluminocopiapiteAl2/3Fe3+4(SO4)6(OH)2 · 20H2O
25.11.27Idrizite(Mg,Fe)(Al,Fe)2(SO4)3(OH)2 · 15H2O or near
25.11.28LishizheniteZnFe2(SO4)4 · 14H2O
25.11.29ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2O

Related Minerals - Dana Grouping (8th Ed.)

29.7.3.1PickeringiteMgAl2(SO4)4 · 22H2O
29.7.3.3ApjohniteMn2+Al2(SO4)4 · 22H2O
29.7.3.4Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2O
29.7.3.5BíliniteFe2+Fe3+2(SO4)4 · 22H2O
29.7.3.6Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4·22H2O
29.7.3.7Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2O

Other Information

Notes:
Completely soluble in water to an acid solution.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Halotrichite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Klaproth (1802) Beiträge zur Krystallographie und Mineralogie, Heidelberg: 3: 102 (as Federalaun vom Freyenwalde).
Glocker, E.F. (1839) Handbuch der Mineralogie, 2nd. edition, Nürnberg: 691 (as Halotrichit).
Forchhammer (1843) Jahresbericht über die Fortschritte der Chemie und Mineralogie, Tübingen: 23: 263 (as Hversalt).
Scacchi (1849) Mem. geol. camp. Nap.: 84 (as Halotrichine).
Uhlig (1912) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 723.
Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 41.
Schairer and Lawson (1926) American Journal of Science: 11: 301.
Doelter, C. (1927) Handbuch der Mineral-chemie: 4 [2]: 523, 545.
Vavrinecz (1929) Magyar Chemiai Folyóirat, Budapest: 35: 1.
Hintze, Carl (1930) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [3B]: 4505, 4512.
Kokta (1930) Přiroda, Brno: 32: 381.
Rutherford (1932) American Mineralogist: 17: 401.
Tokody (1933) Földtani Közlöny, Budapest (Magyarhone Földtani Torsulat): 62: 187.
Lo Sardo (1937) Periodico de Mineralogia-Roma: 8: 281.
Meixner and Pillewizer (1937) Zbl. Min.: 263.
Bandy (1938) American Mineralogist: 23: 724.
Gordon (1942) Academy of Science Philadelphia, Not. Nat. no. 101.
Palache, C., Berman, H., & Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 523-527.
Canadian Mineralogist (1978): 16: 17.
Mihajlovic, T., Karanovic, L., Dimitrijevic, R. (2002) The crystal structure of halotrichite (Fe2+Al2(SO4)4·22H2O) from the mercury mine Šuplja Stena on Mt. Avala, Serbia. Jahrestagung der DGK, Kiel, Germany, March 4-7, 2002; abstract.

Internet Links for Halotrichite

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https://www.mindat.org/min-1809.html
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Specimens:
The following Halotrichite specimens are currently listed for sale on minfind.com.

Localities for Halotrichite

Mineral and/or Locality  
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