Borocookeite Mineral Data

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

Diaphaniety:

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= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.222,KPDmeas= 0.222,KC= 0.2259

Optical Data:

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

Calculated Properties of Borocookeite

Electron Density:

r_electron=2.63 gm/cc
note: r_Borocookeite=2.62 gm/cc.

Fermion Index

Fermion Index = 0.01232
Boson Index = 0.98768

Photoelectric:

PE_Borocookeite= 1.32 barns/electron
U=PE_Borocookeite x r_electron= 3.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Borocookeite is Not Radioactive

Borocookeite Classification

Dana Class:

71.4.1.10 (71)Phyllosilicate Sheets of Six-Membered Rings

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

(71.4.1)Chlorite group (Tri-Dioctahedral)

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

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

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

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

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

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

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

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

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

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

Strunz Class:

VIII/H.23-95 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.23 - Chlorite group

VIII/H.23-10 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

VIII/H.23-20 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-30 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

VIII/H.23-40 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

VIII/H.23-50 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

VIII/H.23-60 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-70 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-80 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho

VIII/H.23-90 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

VIII/H.23-95 Borocookeite Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

VIII/H.23-100 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

VIII/H.23-110 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Borocookeite

Li(1+3x)Al(4-x)(BSi3)O10(OH,F)8 [x = 0-0.33]
Dana No: 71.4.1.10 Strunz No: VIII/H.23-95
Locality:

Notes: