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Hohmannite

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Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta Region, Chile
© 2010, JGW

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Formula:
Fe
3+
2
(SO
 
4
)
 
2
O · 8H
 
2
O
System:TriclinicColour:Brown to burnt orange, ...
Hardness:3
Name:After Thomas Hohmann, mining engineer of Valparaiso, Chile, discoverer of the species.
This page provides mineralogical data about Hohmannite.

Classification of Hohmannite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/D.01-50
Nickel-Strunz 10th (pending) edition ID:7.DB.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
Dana 8th edition ID:31.9.4.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
Hey's CIM Ref.:25.10.14

25 : Sulphates
10 : Sulphates of Fe alone
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Type Occurrence of Hohmannite

Type Locality:Sierra Gorda District, Antofagasta Province, Antofagasta Region, Chile
Year of Discovery:1888
Associated Minerals at type locality:
SideronatriteCopiapiteAmarantite

Physical Properties of Hohmannite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Comment:Brilliant
Colour:Brown to burnt orange, light amaranth-red.
Streak:Orange-yellow
Hardness (Mohs):3
Cleavage:Perfect
On {010}, perfect; on {110} and {1_10}, less perfect.
Density (measured):2.2 g/cm3

Crystallography of Hohmannite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Cell Parameters:a = 9.05Å, b = 10.88Å, c = 7.17Å
α = 90.15°, β = 90.58°, γ = 107°
Ratio:a:b:c = 0.832 : 1 : 0.659
Unit Cell Volume:V 675.09 ų (Calculated from Unit Cell)
Morphology:Crystals short prismatic [001] with faces that are generally rounded and dull or striated. Granular aggregates of subhedral crystals.

Optical Data of Hohmannite

Type:Biaxial (-)
RI values: nα = 1.559 nβ = 1.643 nγ = 1.655
2V:Measured: 40°
Maximum Birefringence:δ = 0.096

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v moderate
Pleochroism:Visible
Comments:X = Very light yellow
Y = Light greenish yellow
Z = Dark greenish yellow

Chemical Properties of Hohmannite

Formula:
Fe
3+
2
(SO
 
4
)
 
2
O · 8H
 
2
O
Essential elements:Fe, H, O, S
All elements listed in formula:Fe, H, O, S

Relationship of Hohmannite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.DB.05Aubertite
CuAl(SO
 
4
)
 
2
Cl · 14H
 
2
O
7.DB.05Magnesioaubertite
(Mg,Cu)Al(SO
 
4
)
 
2
Cl · 14H
 
2
O
7.DB.05Svyazhinite
(Mg,Mn
2+
 
,Ca)(Al,Fe
3+
 
)(SO
 
4
)
 
2
F · 14H
 
2
O
7.DB.10Khademite
Al(SO
 
4
)F · 5H
 
2
O
7.DB.10Rostite
Al(SO
 
4
)(OH) · 5H
 
2
O
7.DB.15Jurbanite
Al(SO
 
4
)(OH) · 5H
 
2
O
7.DB.20Minasragrite
(V
4+
 
O)(SO
 
4
) · 5H
 
2
O
7.DB.20Orthominasragrite
(V
4+
 
O)(SO
 
4
) · 5H
 
2
O
7.DB.20Anorthominasragrite
(V
4+
 
O)(SO
 
4
) · 5H
 
2
O
7.DB.25Bobjonesite
(V
4+
 
O)(SO
 
4
) · 3H
 
2
O
7.DB.30Amarantite
Fe
3+
2
(SO
 
4
)
 
2
O · 7H
 
2
O
7.DB.30Metahohmannite
Fe
3+
2
(SO
 
4
)
 
2
O · 4H
 
2
O
7.DB.35Aluminocopiapite
Al
 
2/3
Fe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
 · 20H
 
2
O
7.DB.35Calciocopiapite
CaFe
 
4
(SO
 
4
)
 
6
(OH)
 
2
 · 10H
 
2
O
7.DB.35Copiapite
Fe
2+
 
Fe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
 · 20H
 
2
O
7.DB.35Cuprocopiapite
CuFe
 
4
(SO
 
4
)
 
6
(OH)
 
2
 · 20H
 
2
O
7.DB.35Ferricopiapite
Fe
 
5
(SO
 
4
)
 
6
O(OH) · 20H
 
2
O
7.DB.35Magnesiocopiapite
MgFe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
 · 20H
 
2
O
7.DB.35Zincocopiapite
ZnFe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
 · 18H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
25.10.1Szomolnokite
FeSO
 
4
 · H
 
2
O
25.10.2Rozenite
FeSO
 
4
 · 4H
 
2
O
25.10.3Siderotil
FeSO
 
4
 · 5H
 
2
O
25.10.4Ferrohexahydrite
FeSO
 
4
 · 6H
 
2
O
25.10.5Melanterite
FeSO
 
4
 · 7H
 
2
O
25.10.6Rhomboclase
(H
 
5
O
 
2
)Fe
3+
 
(SO
 
4
)
 
2
 · 2H
 
2
O
25.10.7Lausenite
Fe
 
2
(SO
 
4
)
 
3
·6H
 
2
O
25.10.8Kornelite
Fe
 
2
(SO
 
4
)
 
3
 · 7H
 
2
O
25.10.9Coquimbite
Fe
 
2-x
Al
 
x
(SO
 
4
)
 
3
 · 9H
 
2
O, x ~0.5
25.10.10Paracoquimbite
Fe
 
2
(SO
 
4
)
 
3
 · 9H
 
2
O
25.10.11Quenstedtite
Fe
 
2
(SO
 
4
)
 
3
 · 10H
 
2
O
25.10.12Ferricopiapite
Fe
 
5
(SO
 
4
)
 
6
O(OH) · 20H
 
2
O
25.10.13Metahohmannite
Fe
3+
2
(SO
 
4
)
 
2
O · 4H
 
2
O
25.10.15Butlerite
Fe
3+
 
(SO
 
4
)(OH) · 2H
 
2
O
25.10.16Parabutlerite
Fe
3+
 
(SO
 
4
)(OH) · 2H
 
2
O
25.10.17Amarantite
Fe
3+
2
(SO
 
4
)
 
2
O · 7H
 
2
O
25.10.18Fibroferrite
Fe
3+
 
(SO
 
4
)(OH) · 5H
 
2
O
25.10.19Hydroniumjarosite
(H
 
3
O)Fe
3+
3
(SO
 
4
)
 
2
(OH)
 
6
25.10.20Römerite
Fe
2+
 
Fe
3+
2
(SO
 
4
)
 
4
 · 14H
 
2
O
25.10.21Bílinite
Fe
2+
 
Fe
3+
2
(SO
 
4
)
 
4
 · 22H
 
2
O
25.10.22Copiapite
Fe
2+
 
Fe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
 · 20H
 
2
O

Other Names for Hohmannite

Synonyms:
Castanite
Other Languages:
German:Hohmannit
Russian:Хохманнит
Spanish:Hohmannita

Other Information

Other Information:Once exposed it dehydrates and crumbles to metahohmannite.

Decomposed by hot water but virtually insoluble in cold water. Readily soluble in HCl.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Hohmannite

Reference List:

- +
Frenzel (1887) Mineralogische und petrographische Mitteilungen, Vienna: 9: 397.

Frenzel (1890) Mineralogische und petrographische Mitteilungen, Vienna: 11: 215.

Darapsky (1890) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I: 56.

Darapsky (1890) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: II: 267 (as Castanite).

Hintze, Carl (1889) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [3B]: 4426.

Rogers (1931) American Mineralogist: 16: 396.

Ungemach (1935) Bulletin de la Société française de Minéralogie: 58: 97.

Bandy (1938) American Mineralogist: 23: 746.

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.: 613-614.

Mineralogical Magazine: 42: 144-146.

Scordari, F., et al.: American Mineralogist(2004): 89: 365-370.

Internet Links for Hohmannite

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  • Raman and XRD data at RRUFF project
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  • Hohmannite details from Handbook of Mineralogy (PDF)
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    • Localities for Hohmannite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Argentina
     
    • San Juan
      • La Alcaparrosa
    		Notulae Naturae of The Academy of Natural Sciences of Philadelphia, # 89 (1941).
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
    		(Tschermaks) Min.Mitt. (1887): 9: 397; 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: 614.
      • El Loa Province
        • Calama
          • Chuquicamata District
    		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: 608, 614.
            • Toki Cu deposit (Toki Cluster)
    		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: 614.
    • Tarapacá Region
      • Iquique Province
        • Pampa del Tamarugal
    		Peter G. Seroka collection
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District Mines
          • Plaka
            • Plaka Mines
    		Lapis, 26, 11 (Nov. 2001), p.43
    USA
     
    • California
      • Napa Co.
        • Knoxville District
          • Knoxville
    		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: 614; Rogers, Austin Flint (1931b), Castanite, a basic ferric sulphate from Knoxville, California: American Mineralogist: 16: 396; Bandy, Mark C. (1932), Castanite from Chuquicamata, Chile: American Mineralogist: 17: 534-537; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 273.
    Mineral and/or Locality
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