Borocookeite Mineral Data

General Borocookeite Information

Chemical Formula:

Li(1+3x)Al(4-x)(BSi3)O10(OH,F)8 [x = 0-0.33]

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

Empirical Formula:

Li_1.6Al_3.8B_0.6Si₃O₁₀F_0.3(OH)_7.8

Environment:

Late stage pocket species in tourmaline-rich miarolitic pegmatites.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Malkhan gem tourmaline deposit, Central Transbaikalia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the boron-rich analog of cookeite.

Synonym:

IMA2000-013

Borocookeite Image

Images:

Borocookeite

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

Axial Ratios:

a:b:c =0.5782:1:1.589

Cell Dimensions:

a = 5.121, b = 8.856, c = 14.073, Z = 2; beta = 96.93° V = 633.57 Den(Calc)= 2.64

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: pseudo C 2/m

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

By Intensity(I/I_o): 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

Cleavage:

{001} Perfect

Color:

Light pinkish gray.

Density:

2.62

Diaphaneity:

Opaque to translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Flakes - Flat, thin crystals or aggregates.

Hardness:

3 - Calcite

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Borocookeite

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

Optical Data:

Biaxial (?), a=1.574, b=1.58, g=1.591, bire=0.0170

Calculated Properties of Borocookeite

Electron Density:

Bulk Density (Electron Density)=2.63 gm/cc
note: Specific Gravity of Borocookeite =2.62 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Borocookeite= 1.32 barns/electron
U=PE_Borocookeite x rElectron Density= 3.46 barns/cc.

Radioactivity:

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

Borocookeite Classification

Dana Class:

71.04.01.10 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.04)interlayered 1:1, 2:1, and octahedra

(71.04.01)Chlorite group (Tri-Dioctahedral)

71.04.01.01 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m

71.04.01.02 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

71.04.01.03 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

71.04.01.04 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.05 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.06 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

71.04.01.07 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

71.04.01.08 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.09 Orthochamosite! (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

71.04.01.10 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

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

References:

NAME( AmMin, v 88, p 830) PHYS. PROP.(AmMin, v 88, p 830) OPTIC PROP.(AmMin, v 88, p 830)

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

Search for Borocookeite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Borocookeite :

A Bijoux Google Search for Borocookeite
Adam's Minerals Google Search for Borocookeite
Cape Minerals Google Search for Borocookeite
Dakota Matrix Minerals Google Search for Borocookeite
Excalibur Mineral Corp. Google Search for Borocookeite
Exceptional Minerals Google Search for Borocookeite
John Betts Fine Minerals Search for Borocookeite
McDougall Minerals Google Search for Borocookeite
Mineral News Website Link
Rock and Mineral Shows Google Search for Borocookeite
Weinrich Minerals, Inc. Google Search for Borocookeite

Ask about Borocookeite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Borocookeite

Li(1+3x)Al(4-x)(BSi3)O10(OH,F)8 [x = 0-0.33]
Dana No: 71.04.01.10 Strunz No: 09.EC.55
Locality:

Notes: