Langhofite
A valid IMA mineral species
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About Langhofite
H. Jörgen S. Langhof
Formula:
Pb2(OH)[WO4(OH)]
Colour:
colourless to white
Lustre:
Adamantine
Hardness:
2½
Specific Gravity:
7.95 (Calculated)
Crystal System:
Triclinic
Name:
The mineral is named for H. Jörgen S. Langhof (b. 1965), curator at the Swedish Museum of Natural History, who collected the discovery sample. He has studied the Långban mines for more than 30 years.
New structure type.
Unique Identifiers
Mindat ID:
53576
Long-form identifier:
mindat:1:1:53576:0
IMA Classification of Langhofite
Approved
Approval year:
2019
First published:
2020
Classification of Langhofite
4.FG.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
G : Hydroxides with OH, without H2O; unclassified
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
G : Hydroxides with OH, without H2O; unclassified
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Lhf | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Langhofite
Adamantine
Transparency:
Transparent
Colour:
Colourless to white
Streak:
White
Hardness:
2½ on Mohs scale
Hardness:
VHN25=130 - 192 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
{010} and {100} cleavages
{010} and {100} cleavages
Fracture:
Irregular/Uneven, Splintery
Density:
7.95(1) g/cm3 (Calculated)
Chemistry of Langhofite
Mindat Formula:
Pb2(OH)[WO4(OH)]
Element Weights:
Elements listed:
Crystallography of Langhofite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.6118(3) Å, b = 7.0748(4) Å, c = 7.3264(4) Å
α = 118.125(6)°, β = 94.503(5)°, γ = 101.146(5)°
α = 118.125(6)°, β = 94.503(5)°, γ = 101.146(5)°
Ratio:
a:b:c = 0.935 : 1 : 1.036
Unit Cell V:
290.79 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.04 Å | (24) |
| 3.330 Å | (17) |
| 3.259 Å | (22) |
| 3.181 Å | (19) |
| 3.079 Å | (24) |
| 3.016 Å | (100) |
| 2.053 Å | (20) |
| 2.050 Å | (18) |
Reference:
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Langhofite
General Appearance of Type Material:
Euhedral crystals up to 4 mm, elongated along the a axis, with lengthwise striations. Occurs in a vug in hematite–pyroxene skarn.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Department of Geosciences, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden, collection number GEO-NRM 20030044
Associated Minerals at Type Locality:
Synonyms of Langhofite
Other Language Names for Langhofite
Dutch:Langhofiet
German:Langhofit
Related Minerals - Strunz-mindat Grouping
| 4.FG.05 | Janggunite | Mn5-x(Mn,Fe)1+xO8(OH)6 |
| 4.FG.10 | Cesàrolite | PbMn4+3O6(OH)2 |
| 4.FG.15 | Kimrobinsonite | (Ta,Nb)(OH)5-2x(O,CO3)x ; x near 1.2 |
| 4.FG.25 | Tashelgite | CaMgFe2+Al9O16(OH) |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Langhofite
mindat.org URL:
https://www.mindat.org/min-53576.html
Please feel free to link to this page.
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Search Engines:
External Links:
References for Langhofite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Mills, Stuart J. (2019) New minerals and nomenclature modifications approved in 2019. CNMNC Newsletter 49. Mineralogical Magazine, 83 (3) 479-483 doi:10.1180/mgm.2019.35
Localities for Langhofite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Sweden (TL) | |
| Holtstam et al. (2020) |
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Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden