Beusite Mineral Data

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General Beusite Information

Chemical Formula:

(Mn++,Fe++,Ca,Mg)3(PO4)2

Composition:

Molecular Weight = 344.81 gm

Calcium 3.49 % Ca 4.88 % CaO

Magnesium 1.41 % Mg 2.34 % MgO

Manganese 28.68 % Mn 37.03 % MnO

Iron 11.34 % Fe 14.59 % FeO

Phosphorus 17.97 % P 41.17 % P₂O₅

Oxygen 37.12 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_1.8Fe²⁺_0.7Ca_0.3Mg_0.2(PO₄)₂

Environment:

Late-stage accessory mineral in complex granite pegmatites and as euhedral inclusions in troilite nodules in an iron meteorite.

IMA Status:

Approved IMA 1968

Locality:

Los Aleros pegmatite, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for Alexey Alexandrovich Beus, Professor of Mineralogy and Geochemistry, Moscow Polytechnical Institute.

Name Pronunciation:

Beusite

Synonym:

ICSD 71051

PDF 36-401

Beusite Image

Images:

Beusite

Comments: Massive pale pinkish-beige beusite with blue vivianite.
Location: Remmelberg, Oberpfalz, Bavaria, Germany. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Beusite Crystallography

Axial Ratios:

a:b:c =0.7621:1:0.5338

Cell Dimensions:

a = 8.78, b = 11.52, c = 6.15, Z = 4; beta = 99.42° V = 613.66 Den(Calc)= 3.73

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 2.863(1), 3.49(1), 2.708(0.6),

Crystal Structure:

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Steele I M , Olsen E , Pluth J J , Davis A M , American Mineralogist , 76 (1991) p.1985-1989, Occurrence and crystal structure of Ca-free beusite in the El Sampal IIIA iron, meteorite

View Additional jPOWD Structure files for Beusite
[1]

Physical Properties of Beusite

Cleavage:

{010} Good, {100} Distinct

Color:

Reddish brown.

Density:

3.6 - 3.7, Average = 3.65

Diaphaneity:

Translucent

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

light pink

Optical Properties of Beusite

Gladstone-Dale:

CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1883,KPDmeas= 0.1925,KC= 0.1906
Ncalc = 1.69 - 1.71

Optical Data:

Biaxial (+), a=1.685-1.708, b=1.688-1.711, g=1.7-1.723, bire=0.0150, 2V(Calc)=54, 2V(Meas)=25. Dispersion r > v strong.

Calculated Properties of Beusite

Electron Density:

Bulk Density (Electron Density)=3.51 gm/cc
note: Specific Gravity of Beusite =3.65 gm/cc.

Fermion Index:

Fermion Index = 0.0040385858
Boson Index = 0.9959614142

Photoelectric:

PE_Beusite= 12.15 barns/electron
U=PE_Beusite x rElectron Density= 42.59 barns/cc.

Radioactivity:

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

Beusite Classification

Dana Class:

38.03.03.02 (38)Anhydrous Phosphates, etc

(38.03)(A+ B++)3 (XO4)2

(38.03.03)Dana Group

38.03.03.01 Graftonite (Fe,Mn,Ca)3(PO4)2 P 2₁/c 2/m

38.03.03.02 Beusite (Mn,Fe,Ca,Mg)3(PO4)2 P 2₁/c 2/m

Strunz Class:

08.AB.20 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AB -With medium-sized cations

08.AB.20 Beusite (Mn,Fe,Ca,Mg)3(PO4)2 P 2₁/c 2/m

08.AB.20 Graftonite (Fe,Mn,Ca)3(PO4)2 P 2₁/c 2/m

Other Beusite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Beusite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Beusite

(Mn++,Fe++,Ca,Mg)3(PO4)2
Dana No: 38.03.03.02 Strunz No: 08.AB.20
Locality:

Notes: