Hapkeite Mineral Data

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General Hapkeite Information

Chemical Formula:

Fe2Si

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 %

Empirical Formula:

Fe⁰⁺_1.27Ni_0.05Cr_0.01Si_0.62P_0.06

Environment:

The new mineral is interpreted to have formed by impact-induced, vapor-phase deposition in lunar soil.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Occurs in a regolith-breccia clast in the lunar meteorite Dhofar 280 from Oman. Link to MinDat.org Location Data.

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.

Synonym:

IMA2003-014

Hapkeite Image

Images:

Hapkeite

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.
© PNAS

Hapkeite Crystallography

Cell Dimensions:

a = 2.831, Z = 1; V = 22.69 Den(Calc)= 6.85

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: P m3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Color:

Yellowish white.

Diaphaneity:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Metallic

Optical Properties of Hapkeite

RL Anisotrophism:

None.

RL Bireflectance:

None.

RL Color:

Yellowish white.

RL Pleochroism:

None.

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**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R

Calculated Properties of Hapkeite

Electron Density:

Bulk Density (Electron Density)=6.47 gm/cc
note: Specific Gravity of Hapkeite =6.85 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Hapkeite= 25.32 barns/electron
U=PE_Hapkeite x rElectron Density= 163.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hapkeite is Not Radioactive

Hapkeite Classification

Dana Class:

01.01.23.04 (01)Native Elements

(01.01)with metallic elements other than the platinum group

(01.01.23)Suessite Group silicides

01.01.23.01 Suessite (Fe,Ni)3Si I m3m 4/m 3 2/m

01.01.23.02 Gupeiite Fe3Si F m3m 4/m 3 2/m

01.01.23.03 Xifengite Fe5Si3 P 6₃/mcm 6/m 2/m 2/m

01.01.23.04 Hapkeite! Fe2Si P m3m 4/m 3 2/m

01.01.23.05 Luobusaite! Fe0.83Si2 C mca 2/m 2/m 2/m

01.01.23.06 Mavlyanovite! Mn5Si3 P 6₃/mcm 6/m 2/m 2/m

01.01.23.07 Brownleeite! MnSi P 2₁3 2 3

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

References:

NAME( AmMin, 90:518) PHYS. PROP.(AmMin, 90:518)

See Also:

Links to other databases for Hapkeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Hapkeite

Fe2Si
Dana No: 01.01.23.04 Strunz No: 01.BB.35
Locality:

Notes: