Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Hohmannite

Big Photo

Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta Region, Chile
© 2008, JGW

Show Hohmannite Photos (2)
Formula:
Fe
3+
2
[O|(SO
 
4
)
 
2
] · 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
mindat.org URL:http://www.mindat.org/min-1918.html
Please feel free to link to this page.

Type Occurrence of Hohmannite

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

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
[O|(SO
 
4
)
 
2
] · 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[Cl|(SO
 
4
)
 
2
] · 14H
 
2
O
7.DB.05Magnesioaubertite
(Mg,Cu)Al[Cl|(SO
 
4
)
 
2
] · 14H
 
2
O
7.DB.05Svyazhinite
(Mg,Mn
2+
 
,Ca)(Al,Fe
3+
 
)[F|(SO
 
4
)
 
2
] · 14H
 
2
O
7.DB.10Khademite
Al[F|SO
 
4
] · 5H
 
2
O
7.DB.10Rostite
Al[OH|SO
 
4
] · 5H
 
2
O
7.DB.15Jurbanite
Al[OH|SO
 
4
] · 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
[O|(SO
 
4
)
 
2
] · 7H
 
2
O
7.DB.30Metahohmannite
Fe
3+
2
[O|(SO
 
4
)
 
2
] · 4H
 
2
O
7.DB.35Aluminocopiapite
Al
 
2/3
Fe
3+
4
[OH|(SO
 
4
)
 
3
]
 
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
[OH|(SO
 
4
)
 
3
]
 
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
[OH|(SO
 
4
)
 
3
]
 
2
 · 20H
 
2
O
7.DB.35Zincocopiapite
ZnFe
3+
4
[OH|(SO
 
4
)
 
3
]
 
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
(SO
 
4
)
 
3
·9H
 
2
O
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
[O|(SO
 
4
)
 
2
] · 4H
 
2
O
25.10.15Butlerite
Fe
3+
 
[OH|SO
 
4
] · 2H
 
2
O
25.10.16Parabutlerite
Fe
3+
 
[OH|SO
 
4
] · 2H
 
2
O
25.10.17Amarantite
Fe
3+
2
[O|(SO
 
4
)
 
2
] · 7H
 
2
O
25.10.18Fibroferrite
Fe
3+
 
[OH|SO
 
4
] · 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
[OH|(SO
 
4
)
 
3
]
 
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

Search Engines:
  • Look for Hohmannite on Google
  • Look for Hohmannite images on Google
    • External Links:
  • Look for Hohmannite on Webmineral
  • Look for Hohmannite on Athena Mineralogy
  • Look for Hohmannite on Wikipedia
  • Look for Hohmannite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Hohmannite in the Natural History Museum (London) online catalogue
  • Hohmannite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Lapis Mineral Magazin
  • SpiriferMinerals.com - high quality specimens
  • Wilensky Fine Minerals
  • Top quality minerals from Kristalle of California
  • Fine Minerals from Dan Weinrich Minerals
  • Wendel Minerals - Auktion & Shop
  • Edwards Minerals - Fine Specimens
  • Buy from David K Joyce minerals
  • Buy minerals from Mineralium.com
  • Buy Minerals and Crystals from Crystalarium.com
  • High-end worldwide specimens & outstanding customer service
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Hohmannite

    Hide Locality List
    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.
    (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
      • 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
    		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.
      • Tocopilla 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.
    • 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
    		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.
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 29th Oct 2009 01:39:23