Hapkeite
A valid IMA mineral species
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About Hapkeite
Formula:
Fe2Si
Colour:
Silvery, with a slight tarnish
Lustre:
Metallic
Specific Gravity:
6.83 (Calculated)
Crystal System:
Isometric
Name:
Named by M. Anand, L.A. Taylor, M.A. Nazarov, J. Shu, H.K. Mao, and R.J. Hemley in 2003 Bruce William Hapke (b. 17 February 1931), planetary geologist and Professor at the University of Pittsburgh, Pennsylvania, USA, who first predicted the presence of vapor-deposited elemental iron as coatings on lunar soil grains. Asteroid 3549 Hapke is also named in his honor.
One of many natural Fe-Si phases; beside the approved species (listed below) you may want to compare Unnamed (Fe silicide I), Unnamed (Fe silicide II) and UM2000-60-Si:Fe.
Unique Identifiers
Mindat ID:
26419
Long-form identifier:
mindat:1:1:26419:0
GUID
(UUID V4):
(UUID V4):
a53758af-f520-453a-96fe-430420eb31d7
IMA Classification of Hapkeite
Classification of Hapkeite
1.BB.35
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
B : Metallic Carbides, Silicides, Nitrides, Phosphides and Hydrides
B : Silicides
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
B : Metallic Carbides, Silicides, Nitrides, Phosphides and Hydrides
B : Silicides
1.1.33.6
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
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 |
---|---|---|
Hpk | 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 Hapkeite
Metallic
Transparency:
Opaque
Colour:
Silvery, with a slight tarnish
Density:
6.83 g/cm3 (Calculated)
Optical Data of Hapkeite
Reflectivity:
Wavelength | R |
---|---|
470nm | 47.1% |
546nm | 48.8% |
589nm | 50.0% |
650nm | 50.9% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 50.9%.
Colour in reflected light:
yellowish white
Chemistry of Hapkeite
Mindat Formula:
Fe2Si
Elements listed:
Crystallography of Hapkeite
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Pm3m
Cell Parameters:
a = 2.831 Å
Unit Cell V:
22.69 ų
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0019759 | Hapkeite | Anand M, Taylor L A, Nazarov M A, Shu J, Mao H K, Hemley R J (2005) Space weathering on airless planetary bodies: Clues from the lunar mineral hapkeite Proceedings of the National Academy of Sciences 101 6847-6851 | 2005 | lunar meteorite Dhofar 280 from Oman | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.831 Å | (n.d.) |
2.000 Å | (n.d.) |
1.631 Å | (n.d.) |
1.415 Å | (n.d.) |
1.267 Å | (n.d.) |
1.157 Å | (n.d.) |
1.000 Å | (n.d.) |
Type Occurrence of Hapkeite
General Appearance of Type Material:
Grains from 2 to 30 microns in size.
Place of Conservation of Type Material:
n.d.
Geological Setting of Type Material:
Lunar meteorite - Dhofar-280 - a fragmental highland breccia with well-preserved primary igneous clasts and negligible terrestrial alteration.
Associated Minerals at Type Locality:
Synonyms of Hapkeite
Other Language Names for Hapkeite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
1.BB. | Zangboite | TiFeSi2 |
1.BB. | Brownleeite | MnSi |
1.BB. | Kangjinlaite | Ti11Si10 |
1.BB. | Toledoite | TiFeSi |
1.BB. | Yeite | TiSi |
1.BB.05 | Suessite | (Fe,Ni)3Si |
1.BB.05 | Mavlyanovite | Mn5Si3 |
1.BB.10 | UM2001-18-Si:CuPtSn | (Cu,Pt)4Si |
1.BB.10 | Perryite | (Ni,Fe)5(Si,P)2 |
1.BB.15 | Naquite | FeSi |
1.BB.20 | Linzhiite | FeSi2 |
1.BB.25 | Luobusaite | Fe0.84Si2 |
1.BB.30 | Gupeiite | Fe3Si |
1.BB.40 | Xifengite | Fe5Si3 |
1.BB.45 | Carletonmooreite | Ni3Si |
1.BB.55 | Palladosilicide | Pd2Si |
1.BB.65 | Zhiqinite | TiSi2 |
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 Hapkeite
mindat.org URL:
https://www.mindat.org/min-26419.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Hapkeite
Localities for Hapkeite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Bulgaria | |
| Rappenglück (2022) |
Oman (TL) | |
| LPSC 34 +1 other reference |
Russia | |
| Rappenglück (2022) |
| Rappenglück (2022) |
Ukraine | |
| Steffen Möckel EDS analysis (2006) |
The Moon | |
| Pavel.M. Kartashov (n.d.) |
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