Mineralogy Database

Hapkeite Mineral Data

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General Hapkeite Information

Help on Chemical  Formula: Chemical Formula: Fe2Si
Help on Composition: Composition: Molecular Weight = 93.65 gm
   Chromium     0.56 %  Cr
   Iron        75.73 %  Fe
   Silicon     18.59 %  Si
   Nickel       3.13 %  Ni
   Phosphorus   1.98 %  P
              100.00 % 
Help on Empirical Formula: Empirical Formula: Fe0+1.27Ni0.05Cr0.01Si0.62P0.06
Help on Environment: Environment: The new mineral is interpreted to have formed by impact-induced, vapor-phase deposition in lunar soil.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Occurs in a regolith-breccia clast in the lunar meteorite Dhofar 280 from Oman. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Bruce Hapke (emeritus, University of Pittsburgh). who first predicted the presence of vapor-deposited elemental Fe as coatings on lunar soil grains.
Help on Synonym: Synonym: IMA2003-014

Hapkeite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: Reflected-light image of an area in the regolith clast showing distribution of FeNi metal and hapkeite (Fe2Si) metal grains in a feldspathic matrix, Msk, Maskelynite.. (Proc. Nat. Acad. Sci.,101:6848).
Location: Dhofar 280 (Dh-280) is a lunar fragmental breccia meteorite found in the Dhofar region of Oman, in April, 2001. Scale: See Image.

Hapkeite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 2.831, Z = 1; V = 22.69 Den(Calc)= 6.85
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: P m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.831(0)(100), 2(0)(110), 1.631(0)(111),1.415(0)(200), 1.267(0)(210), 1.157(0)(211), 1(0)(220),

Physical Properties of Hapkeite

Help on Color: Color: Yellowish white.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Luster: Luster: Metallic

Optical Properties of Hapkeite

Help on RL Anisotrophism: RL Anisotrophism: None.
Help on RL Bireflectance: RL Bireflectance: None.
Help on RL Color: RL Color: Yellowish white.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Hapkeite in Air
λ R  ∑ R(λ) 
 470 nm   47.10   
 546 nm   48.80 
 589 nm   50.00 
 650 nm   50.90 
Calculated Relative Intensity Colors of Hapkeite in Air
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180% 190%

Calculated Properties of Hapkeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.47 gm/cc
note: Specific Gravity of Hapkeite =6.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEHapkeite = 25.32 barns/electron
U=PEHapkeite x rElectron Density= 163.83 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hapkeite is Not Radioactive

Hapkeite Classification

Help on  Dana Class: Dana Class: (01)Native Elements
  (01.01)with metallic elements other than the platinum group
  (01.01.23)Suessite Group silicides Suessite (Fe,Ni)3Si I m3m 4/m 3 2/m Gupeiite Fe3Si F m3m 4/m 3 2/m Xifengite Fe5Si3 P 63/mcm 6/m 2/m 2/m Hapkeite! Fe2Si P m3m 4/m 3 2/m Luobusaite! Fe0.83Si2 C mca 2/m 2/m 2/m Mavlyanovite! Mn5Si3 P 63/mcm 6/m 2/m 2/m Brownleeite! MnSi P 213 2 3
Help on  Strunz Class: Strunz Class: 01.BB.35 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
  01.B - Metallic Carbides, Silicides, Nitrides and Phosphides
  01.BB -Silicides
01.BB.35 Hapkeite! Fe2Si P m3m 4/m 3 2/m

Other Hapkeite Information

Help on References: References: NAME( AmMin, 90:518) PHYS. PROP.(AmMin, 90:518)
Help on See Also: See Also: Links to other databases for Hapkeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 01.BB.35





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