Mineralogy Database

Bobierrite Mineral Data

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General Bobierrite Information

Help on Chemical  Formula: Chemical Formula: Mg3(PO4)2•8(H2O)
Help on Composition: Composition: Molecular Weight = 406.98 gm
   Magnesium   17.92 %  Mg   29.71 % MgO
   Phosphorus  15.22 %  P    34.88 % P2O5
   Hydrogen     3.96 %  H    35.41 % H2O
   Oxygen      62.90 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg3(PO4)2•8(H2O)
Help on Environment: Environment: Formed from the chemical alteration of guano deposits (Mejillones, Chile; Imperial Canyon lava tubes, Kenya), and an elephant tusk (Edgerton, Minnesota, USA).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1868
Help on Locality: Locality: Found on Mejillones Island, Chile. In Western Australia, found in the Pilbara district, at Wodgina. From Marlborough, New Zealand. In the USA, sound near Edgerton, Pipestone Co., Minne Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: In honor of Pierre Adolphe Bobierre (1823-1881), French agricultural chemist, who first described the mineral.
Help on Name Pronunciation: Name Pronunciation: Bobierrite + Pronunciation Say BOBIERRITE

Bobierrite Image

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Comments: Crystal group of bobierrite partially covered by yellow calcite.
Location: Zheleznyi Mine, Kovdor, Kola Penisula, Russia. Scale: Crystal size 1 cm.
© John Veevaert

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  Strontiowhitlockite   Bobierrite

Comments: Pale white to pink fine grained strontiowhitlockite with bobierrite.
Location: Kovdor Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bobierrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.1671:1:0.3604
Help on Cell Dimensions: Cell Dimensions: a = 4.667, b = 27.926, c = 10.067, Z = 4; beta = 105.01° V = 1,267.27 Den(Calc)= 2.13
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.96(1), 2.94(0.27), 8.04(0.18),

Physical Properties of Bobierrite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Colorless, Gray, White.
Help on Density: Density: 2.195
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Bobierrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2547,KPDmeas= 0.2472,KC= 0.2436
Ncalc = 1.52 - 1.53
Help on Optical Data: Optical Data: Biaxial (+), a=1.51-1.5468, b=1.52-1.5533, g=1.543-1.582, bire=0.0330-0.0352, 2V(Calc)=52-68, 2V(Meas)=53-71.

Calculated Properties of Bobierrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.27 gm/cc
note: Specific Gravity of Bobierrite =2.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBobierrite = 1.21 barns/electron
U=PEBobierrite x rElectron Density= 2.75 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bobierrite is Not Radioactive

Bobierrite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 � x(H2O)
  (40.03.07)Dana Group Bobierrite Mg3(PO4)2•8(H2O) C 2/c 2/m Manganohornesite (Mn,Mg)3(AsO4)2•8(H2O) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.CE.35 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CE -With only medium-sized cations, RO4:H2O � 1:2.5
08.CE.35 Bobierrite Mg3(PO4)2•8(H2O) C 2/c 2/m

Other Bobierrite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Bobierrite :
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

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Dana No: Strunz No: 08.CE.35





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