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Hopmannite
A valid IMA mineral species
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About Hopmannite
Michael Hopmann
Formula:
Ba2(Ti5Fe)O13
Colour:
black to dark-grey
Lustre:
Sub-Metallic
Hardness:
5 - 5½
Specific Gravity:
4.15 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
The name hopmannite is given in honour of Dr Michael Hopmann (1874-1962), a monk from Maria Laach monastery, a mineral collector, and one of the best experts on volcanism in the Eifel region at that time, who also specialized in the wider field of geology, especially in petrography and soil science. His research work and numerous scientific papers earned him the reputation of the best Laach volcanic region expert. In 1949, at the age of 75, he was given a teaching position at the Institute of Mineralogy at the University of Bonn, where he lectured on the topic of "Regional Petrography of the Eifel Mountains." Ten years later, the Institute honoured him with a ceremonial colloquium when the Federal President awarded him the Grand Cross of the Order of Merit. Among the inhabitants of the Eifel districts, who also valued him as a pastor, he soon became known as "Dr Stein" (Dr Stone) or "der Steinepater" (father of stones).
It was certainly impressive for outsiders to see him striding across the harvested fields in autumn, dressed in his monk's robe and with his head bowed, always on the lookout for volcanic ejecta.
It was certainly impressive for outsiders to see him striding across the harvested fields in autumn, dressed in his monk's robe and with his head bowed, always on the lookout for volcanic ejecta.
Type Locality:
This page provides mineralogical data about Hopmannite.
Unique Identifiers
Mindat ID:
494657
Long-form identifier:
mindat:1:1:494657:7
Similar Names
| Hofmannite | A synonym of Branchite | |
| Hohmannite | A valid IMA mineral species - grandfathered | Fe23+(SO4)2O · 8H2O |
IMA Classification of Hopmannite
Approved
IMA Formula:
Ba2(Ti4+5Fe2+)O13
Approval year:
2025
Classification of Hopmannite
4.CC.25
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
C : With large and medium-sized cations
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
C : With large and medium-sized cations
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 for Standard |
|---|---|---|
| Hpn | 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 Hopmannite
Sub-Metallic
Transparency:
Opaque
Colour:
Black to dark-grey
Streak:
Gray
Hardness:
5 - 5½ on Mohs scale
Hardness:
VHN25=632 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
along (100)
along (100)
Fracture:
Irregular/Uneven
Density:
4.15 g/cm3 (Calculated)
Optical Data of Hopmannite
Anisotropism:
weak
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 470nm | 14.0% | 14.5% |
| 546nm | 13.8% | 13.9% |
| 589nm | 13.3% | 13.5% |
| 650nm | 13.1% | 13.3% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 14.5%.
R1 shown in black, R2 shown in red
Colour in reflected light:
black to darkgrey
Chemistry of Hopmannite
Mindat Formula:
Ba2(Ti5Fe)O13
Element Weights:
Elements listed:
Crystallography of Hopmannite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 15.357(2) Å, b = 3.8500(7) Å, c = 9.129(2) Å
β = 99.03(1)°
β = 99.03(1)°
Ratio:
a:b:c = 3.989 : 1 : 2.371
Unit Cell V:
533.06 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.063 Å | (100) |
| 2.988 Å | (99) |
| 2.957 Å | (60) |
| 2.821 Å | (54) |
| 2.820 Å | (50) |
| 2.087 Å | (62) |
| 2.070 Å | (53) |
| 1.925 Å | (72) |
Reference:
Comments:
the powder diffraction pattern was calculated using VESTA 3 software (Momma and Izumi 2011), based on the results of single-crystal structure refinement.
Type Occurrence of Hopmannite
General Appearance of Type Material:
thin platy crystals
Place of Conservation of Type Material:
Type material is deposited in the collections of the Natural History Museum Mainz, State Collection of Natural History of Rhineland-Palatinate, Reichklarastr. 10, D-55116 Mainz, Germany, catalogue number M_2025/862
Geological Setting of Type Material:
A newly discovered xenolith, measuring approximately
70×50×30 cm3, consists of a few multi-coloured zones
characterised by variable mineral associations.
Hopmannite was identified in the dark-grey zones of this
xenolith, alongside characteristic irregular milky aggregates of Ca-bearing hydrosilicates
70×50×30 cm3, consists of a few multi-coloured zones
characterised by variable mineral associations.
Hopmannite was identified in the dark-grey zones of this
xenolith, alongside characteristic irregular milky aggregates of Ca-bearing hydrosilicates
Synonyms of Hopmannite
Other Language Names for Hopmannite
Dutch:Hopmanniet
Relationship of Hopmannite to other Species
Member of:
Other Members of Jeppeite Group:
Related Minerals - Strunz-mindat Grouping
| 4.CC. | Bernwoodite | Ca5TiAl2Si2O14 |
| 4.CC. | Xuite | Ca3Fe3+2[(AlO3(OH)]3 |
| 4.CC. | Yttriaite-(Y) | Y2O3 |
| 4.CC. | Allendeite | Sc4Zr3O12 |
| 4.CC. | Chlorkyuygenite | Ca12Al14O32[(H2O)4Cl2] |
| 4.CC. | Magnesiohongruiite-(Fe3+) | (Mg2Fe3+)Fe3+NbO7(OH) |
| 4.CC. | Oboniobite | Mg4Nb2O9 |
| 4.CC. | Botuobinskite | SrFe2+Mg2(Cr3+6Ti4+12)[O36(OH)2] |
| 4.CC. | Mirnyite | SrZr4+Mg2(Cr3+6Ti4+12)O38 |
| 4.CC. | Haitaite-(La) | LaU4+Fe3+2(Ti13Fe2+4Fe3+)O38 |
| 4.CC. | Shagamite | KFe11O17 |
| 4.CC. | Bitikleite | Ca3(Sb5+Sn4+)[AlO4]3 |
| 4.CC. | Anzaite-(Ce) | Ce3+ 4Fe2+Ti6O18 (OH)2 |
| 4.CC. | Heamanite-(Ce) | (K0.5Ce0.5)TiO3 |
| 4.CC. | Priscillagrewite-(Y) | (Ca2Y)Zr2(AlO4)3 |
| 4.CC. | Strandite | Pb3Mn3+4Mn4+3O15 |
| 4.CC. | Saranovskite | SrCaFe2+2(Cr4Ti2)Ti12O38 |
| 4.CC.05 | Chrombismite | Bi3+16Cr6+O27 |
| 4.CC.10 | Freudenbergite | Na2(Ti,Fe)8O16 |
| 4.CC.10 | Fluormayenite | Ca12Al14O32F2 |
| 4.CC.10 | Fluorkyuygenite | Ca12Al14O32[(H2O)4F2] |
| 4.CC.15 | Grossite | CaAl4O7 |
| 4.CC.17 | Goldschmidtite | KNbO3 |
| 4.CC.20 | 'Unnamed (HBU UK-4)' | NaFe2+Zn2(Ti,Fe3+,Nb)6Ti12O38 |
| 4.CC.20 | Chlormayenite | Ca12Al14O32[◻4Cl2] |
| 4.CC.20 | Paseroite | PbMn2+(Mn2+,Fe3+)2(V5+,Ti,◻)18O38 |
| 4.CC.20 | Mianningite | (◻,Pb,Ce,Na)(U4+,Mn,U6+)Fe3+2 (Ti,Fe3+)18O38 |
| 4.CC.20 | 'UM1987-03-O:FePbTiU' | ~(U,Pb)(Ti,Fe3+,Fe2+,Mn)21O38 |
| 4.CC.22 | Gorerite | CaAlFe3+11O19 |
| 4.CC.22 | Kahlenbergite | KAl11O17 |
| 4.CC.25 | Nixonite | Na2Ti6O13 |
| 4.CC.25 | Yafsoanite | Ca3Te6+2(ZnO4)3 |
| 4.CC.30 | Latrappite | Ca2NbFe3+O6 |
| 4.CC.30 | Natroniobite | NaNbO3 |
| 4.CC.30 | Perovskite | CaTiO3 |
| 4.CC.30 | Lueshite | NaNbO3 |
| 4.CC.30 | Bariolakargiite | BaZrO3 |
| 4.CC.30 | Barioperovskite | BaTiO3 |
| 4.CC.30 | Megawite | CaSnO3 |
| 4.CC.30 | Lakargiite | Ca(Zr,Sn,Ti)O3 |
| 4.CC.32 | Usturite | Ca3(Sb5+Zr)[Fe3+O4]3 |
| 4.CC.32 | Elbrusite | Ca3(U6+0.5Zr1.5)[Fe3+O4]3 |
| 4.CC.32 | Monteneveite | Ca3Sb5+2(Fe3+2Fe2+)O12 |
| 4.CC.32 | Dzhuluite | Ca3(Sb5+Sn4+)[Fe3+O4]3 |
| 4.CC.35 | Tausonite | SrTiO3 |
| 4.CC.35 | Loparite | (Na,REE)2Ti2O6 |
| 4.CC.35 | Panguite | (Ti,Al,Sc,Mg,Zr,Ca)1.8O3 |
| 4.CC.35 | Isolueshite | (Na,La)NbO3 |
| 4.CC.35 | Macedonite | PbTiO3 |
| 4.CC.37 | Pauloabibite | NaNbO3 |
| 4.CC.40 | Landauite | NaMnZn2(Ti,Fe)6Ti12O38 |
| 4.CC.40 | Mathiasite | (Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12 |
| 4.CC.40 | Senaite | Pb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38 |
| 4.CC.40 | Gramaccioliite-(Y) | (Pb,Sr)(Y,Mn)Fe3+2(Ti,Fe3+)18O38 |
| 4.CC.40 | Lindsleyite | (Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38 |
| 4.CC.40 | Crichtonite | Sr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38 |
| 4.CC.40 | Loveringite | (Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38 |
| 4.CC.40 | Cleusonite | (Pb,Sr)(U4+,U6+)(Fe2+,Zn)2(Ti,Fe2+,Fe3+)18(O,OH)38 |
| 4.CC.40 | Davidite-(Ce) | Ce(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 |
| 4.CC.40 | Davidite-(La) | La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 |
| 4.CC.40 | 'Davidite-(Y)' | (La,Ce,Na,Ca,Pb)(Y,Fe2+,◻)(Fe2+,Mn2+)2(Ti,Fe3+,Nb,Zr)18O38 (hypothetical) |
| 4.CC.40 | 'Uhligite' | Ca3(Ti,Al,Zr)9O20 ? |
| 4.CC.40 | Dessauite-(Y) | (Sr,Pb)(Y,U)(Ti,Fe3+)20O38 |
| 4.CC.45 | Diaoyudaoite | NaAl11O17 |
| 4.CC.45 | Yimengite | K(Cr,Ti,Fe,Mg)12O19 |
| 4.CC.45 | Nežilovite | PbZn2Mn4+2Fe3+8O19 |
| 4.CC.45 | Hawthorneite | BaMgTi3Cr4Fe2+2Fe3+2O19 |
| 4.CC.45 | Mizraite-(Ce) | Ce(Al11Mg)O19 |
| 4.CC.45 | Haggertyite | BaFe2+4Fe3+2Ti5MgO19 |
| 4.CC.45 | Lindqvistite | Pb2Mn2+Fe16O27 |
| 4.CC.45 | Hibonite | CaAl12O19 |
| 4.CC.45 | Kangite | (Sc,Ti,Al,Zr,Mg,Ca,◻)2O3 |
| 4.CC.45 | Chihuahuaite | FeAl12O19 |
| 4.CC.45 | Barioferrite | BaFe3+12O19 |
| 4.CC.45 | Plumboferrite | Pb[Fe3+10.67Mn2+0.33Pb]O18.33 |
| 4.CC.45 | Batiferrite | BaTi2Fe3+8Fe2+2O19 |
| 4.CC.45 | Magnetoplumbite | PbFe3+12O19 |
| 4.CC.50 | Jeppeite | K2Ti6O13 |
| 4.CC.55 | Zenzénite | Pb3Fe3+4Mn4+3O15 |
| 4.CC.60 | 'Mengxianminite (of Huang et al.)' | (Ca,Na)3(Fe,Mn)2Mg2(Sn,Zn)5Al8O29 |
Fluorescence of Hopmannite
none
Other Information
Magnetism:
Non-Magnetic
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 Hopmannite
mindat.org URL:
https://www.mindat.org/min-494657.html
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References for Hopmannite
Localities for Hopmannite
Showing 1 localities.
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.
Germany (TL) | |
| Juroszek et al. (2025) +1 other reference |
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Xenolith CS-090, Seekante, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany