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Bertossaite Mineral Data

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General Bertossaite Information

Help on Chemical  Formula: Chemical Formula: Li2CaAl4(PO4)4(OH)4
Help on Composition: Composition: Molecular Weight = 609.80 gm
   Lithium      2.28 %  Li    4.90 % Li2O
   Calcium      6.57 %  Ca    9.20 % CaO
   Aluminum    17.70 %  Al   33.44 % Al2O3
   Phosphorus  20.32 %  P    46.55 % P2O5
   Hydrogen     0.66 %  H     5.91 % H2O
   Oxygen      52.47 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Li2CaAl4(PO4)4(OH)4
Help on Environment: Environment: Ca analog of palermoite.
Help on IMA Status: IMA Status: Approved IMA 1966
Help on Locality: Locality: Buranga lithium pegmatite, Gatumba, Rwanda. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Antonio Bertossa, director of the Geological Survey of Rwanda.
Help on Name Pronunciation: Name Pronunciation: Bertossaite + Pronunciation Say BERTOSSAITE

Bertossaite Image

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Comments: Pale pinkish crystalline bertossaite with yellowish apatite and blue lazulite.
Location: Buranga Pegmatite, near Gatumba, Gisenyi, Rwanda. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bertossaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7298:1:0.4596
Help on Cell Dimensions: Cell Dimensions: a = 11.48, b = 15.73, c = 7.23, Z = 4; V = 1,305.60 Den(Calc)= 3.10
Help on Crystal System: Crystal System: Orthorhombic Space Group: Imaa,Iaa2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.056(1), 3.104(0.7), 3.286(0.7),

Physical Properties of Bertossaite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Light pink.
Help on Density: Density: 3.1
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Bertossaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2045,KPDmeas= 0.2045,KC= 0.2089
Ncalc = 1.65
Help on Optical Data: Optical Data: Biaxial (-), a=1.624, b=1.636, g=1.642, bire=0.0180

Calculated Properties of Bertossaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.07 gm/cc
note: Specific Gravity of Bertossaite =3.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0020489543
Boson Index = 0.9979510457
Help on Photoelectric: Photoelectric: PEBertossaite = 2.33 barns/electron
U=PEBertossaite x rElectron Density= 7.15 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bertossaite is Not Radioactive

Bertossaite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.07)where (A B)m (XO4)4 Zq
  (41.07.01)Palermoite Group Palermoite (Sr,Ca)(Li,Na)2Al4(PO4)4(OH)4 I mmm 2/m 2/m 2/m Bertossaite Li2CaAl4(PO4)4(OH)4 Imaa,Iaa2 Ortho
Help on  Strunz Class: Strunz Class: 08.BH.25 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
08.BH.25 Bertossaite Li2CaAl4(PO4)4(OH)4 Imaa,Iaa2 Ortho
08.BH.25 Palermoite (Sr,Ca)(Li,Na)2Al4(PO4)4(OH)4 I mmm 2/m 2/m 2/m

Other Bertossaite Information

Help on References: References: NAME( Dana8) 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 Bertossaite :
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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Print or Cut-and-Paste your Bertossaite Specimen Label here :


Dana No: Strunz No: 08.BH.25





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