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Borocookeite Mineral Data

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General Borocookeite Information

Help on Chemical  Formula: Chemical Formula: Li(1+3x)Al(4-x)(BSi3)O10(OH,F)8 [x = 0-0.33]
Help on Composition: Composition: Molecular Weight = 502.73 gm
   Lithium    2.21 %  Li    4.76 % Li2O
   Aluminum  20.39 %  Al   38.53 % Al2O3
   Silicon   16.76 %  Si   35.85 % SiO2
   Boron      1.29 %  B     4.15 % B2O3
   Hydrogen   1.56 %  H    13.98 % H2O
   Oxygen    56.65 %  O
   Fluorine   1.13 %  F     1.13 % F
               -   %   F    -0.48 % -O=F2    
            ______        ______ 
            100.00 %       97.93 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Li1.6Al3.8B0.6Si3O10F0.3(OH)7.8
Help on Environment: Environment: Late stage pocket species in tourmaline-rich miarolitic pegmatites.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Malkhan gem tourmaline deposit, Central Transbaikalia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the boron-rich analog of cookeite.
Help on Synonym: Synonym: IMA2000-013

Borocookeite Image

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Comments: Black and white image of multicolored tourmaline crystals (1) in fine-flaky aggregate of borocookeite (2). (AmMin, v 88, p 831).
Location: Sosedka and Mokhovaya pegmatite veins, Malkhan gem tourmaline deposit, Chikoy district, Chita oblast, Russia. Scale: Sample size is 5 x 5 cm.
© American Mineralogist

Borocookeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5782:1:1.589
Help on Cell Dimensions: Cell Dimensions: a = 5.121, b = 8.856, c = 14.073, Z = 2; beta = 96.93° V = 633.57 Den(Calc)= 2.64
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: pseudo C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.512(1)(004), 14.1(1)(001), 4.71(0.7)(003),7.05(0.5)(002), 2.807(0.2)(005), 1.946(0.17)(204), 2.304(0.16)(202), 2.332(0.14)(006), 1.62(0.1)(206),

Physical Properties of Borocookeite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Light pinkish gray.
Help on Density: Density: 2.62
Help on Diaphaneity: Diaphaneity: Opaque to translucent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Flakes - Flat, thin crystals or aggregates.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: white

Optical Properties of Borocookeite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2203,KPDmeas= 0.222,KC= 0.2259
Ncalc = 1.59 - 1.6
Help on Optical Data: Optical Data: Biaxial (?), a=1.574, b=1.58, g=1.591, bire=0.0170

Calculated Properties of Borocookeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.63 gm/cc
note: Specific Gravity of Borocookeite =2.62 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBorocookeite = 1.32 barns/electron
U=PEBorocookeite x rElectron Density= 3.46 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Borocookeite is Not Radioactive

Borocookeite Classification

Help on  Dana Class: Dana Class: (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.04)interlayered 1:1, 2:1, and octahedra
  (71.04.01)Chlorite group (Tri-Dioctahedral) Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m Orthochamosite! (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EC.55 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.55 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m
09.EC.55 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri
09.EC.55 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
09.EC.55 Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m
09.EC.55 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m
09.EC.55 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2
09.EC.55 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
09.EC.55 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho
09.EC.55 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m
09.EC.55 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho
09.EC.55 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m
09.EC.55 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m
09.EC.55 Glagolevite! NaMg6[Si3AlO10](OH,O)8•H2O C1 1
09.EC.55 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

Other Borocookeite Information

Help on References: References: NAME( AmMin, v 88, p 830) PHYS. PROP.(AmMin, v 88, p 830) OPTIC PROP.(AmMin, v 88, p 830)
Help on See Also: See Also: Links to other databases for Borocookeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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


Li(1+3x)Al(4-x)(BSi3)O10(OH,F)8 [x = 0-0.33]
Dana No: Strunz No: 09.EC.55





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