Beusite Mineral Data
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 % P2 O5
Oxygen 37.12 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Mn2+ 1.8 Fe2+ 0.7 Ca0.3 Mg0.2 (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 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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /c
X Ray Diffraction:
By Intensity(I/Io ): 2.863(1), 3.49(1), 2.708(0.6),
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:
PEBeusite = 12.15 barns/electronU=PEBeusite x r Electron 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:
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