Allabogdanite Mineral Data

General Allabogdanite Information

Chemical Formula:

(Fe,Ni)2P

Composition:

Molecular Weight = 145.21 gm

Iron 57.69 % Fe

Cobalt 1.22 % Co

Nickel 20.61 % Ni

Phosphorus 20.48 % P

______

100.00 %

Empirical Formula:

Fe²⁺_1.5Ni_0.51Co_0.03P_0.96

Environment:

Microscopic exsolved laths disseminated in plessite. Isostructural with rhodarsenide. Orthorohmbic polymoph of barringerite,

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Onello meteorite, an iron-rich ataxite, was found in the alluvium of the Bol'shoy Dolguchan River, Onello River Basin, Aldan shield, Sakha-Yakutia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Alla Bogdanova, Geological Institute, Kola Science Centre of Russian Academy of Sciences.

Synonym:

IMA2000-038

Allabogdanite Image

Images:

Allabogdanite Schreibersite

Comments: Relict grain of allabogdanite crystal (ABG) surrounded by schreibersite rim (SCHR) in plessite matrix (PL). Black phase is a secondary Fe-Ni-hydroxide. Backscattered electron image. (AmMin, 87:1249).
Location: Onello iron meteorite (high-Ni ataxite) Onello River basin, Aldan shield, Saha (Sakha) Republic (Yakutia), Eastern-Siberian Region, Russia. Scale: Scale bar 10 µ-m.
© American Mineralogist

Allabogdanite Crystallography

Axial Ratios:

a:b:c =1.62:1:1.8773

Cell Dimensions:

a = 5.748, b = 3.548, c = 6.661, Z = 4; V = 135.84 Den(Calc)= 7.10

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 2.238(1)(112), 2.12(0.8)(211), 2.073(0.7)(103),1.884(0.5)(013), 1.758(0.4), 1.774(0.4)(020), 1.788(0.4)(113), 1.843(0.4)(301),

Physical Properties of Allabogdanite

Cleavage:

None

Color:

Light straw yellow.

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Metallic

Optical Properties of Allabogdanite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Allabogdanite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
440 nm	48.40	37.20
460 nm	46.70	36.80
480 nm	47.00	37.60
500 nm	47.50	38.10
520 nm	47.60	38.80
540 nm	48.20	39.20
560 nm	49.00	39.90
580 nm	49.60	40.70
600 nm	50.10	41.90
620 nm	50.50	41.90
640 nm	51.90	43.00
660 nm	52.30	44.30
680 nm	53.30	45.00
700 nm	54.40	46.20

**Calculated Relative Intensity Colors of Allabogdanite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%
R₁
R₂

Calculated Properties of Allabogdanite

Electron Density:

Bulk Density (Electron Density)=6.70 gm/cc
note: Specific Gravity of Allabogdanite =7.10 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Allabogdanite}= 27.44 barns/electron
U=PE_{Allabogdanite} x rElectron Density= 183.80 barns/cc.

Radioactivity:

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

Allabogdanite Classification

Dana Class:

01.01.21.04 (01)Native Elements

(01.01)with metallic elements other than the platinum group

(01.01.21)Barringerite Group phosphides

01.01.21.01 Barringerite (Fe,Ni)2P P 62m 6 m2

01.01.21.02 Schreibersite (Fe,Ni)3P I 4 4

01.01.21.03 Nickelphosphide! (Ni,Fe)3P I 4 4

01.01.21.04 Allabogdanite! (Fe,Ni)2P P nma 2/m 2/m 2/m

01.01.21.05 Melliniite! (Ni,Fe)4P P 2₁3 2 3

01.01.21.06 Monipite! MoNiP P 6 2m 6 m2

Strunz Class:

01.BD.15 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.B - Metallic Carbides, Silicides, Nitrides and Phosphides

01.BD -Phosphides

01.BD.15 Allabogdanite! (Fe,Ni)2P P nma 2/m 2/m 2/m

01.BD.15 Florenskyite! (Fe,Ni)TiP P nma 2/m 2/m 2/m

01.BD.15 Andreyivanovite! FeCrP P nma 2/m 2/m 2/m

Other Allabogdanite Information

References:

NAME( AmMin, 87:1245) PHYS. PROP.(AmMin, 87:1245) OPTIC PROP.(AmMin, 87:1245)

See Also:

Links to other databases for Allabogdanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

Search for Allabogdanite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Allabogdanite :

Ask about Allabogdanite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Allabogdanite Specimen Label here :

Allabogdanite

(Fe,Ni)2P
Dana No: 01.01.21.04 Strunz No: 01.BD.15
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.