General Cookeite Information
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Chemical Formula: |
LiAl4(Si3Al)O10(OH)8 |
Composition: |
Molecular Weight = 522.16 gm |
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Lithium 1.33 % Li 2.86 % Li2O |
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Aluminum 25.84 % Al 48.82 % Al2O3 |
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Silicon 16.14 % Si 34.52 % SiO2 |
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Hydrogen 1.54 % H 13.80 % H2O |
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Oxygen 55.15 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
LiAl5Si3O10(OH)8 |
Environment: |
Alteration of lithia tourmalines and lepidolite in pegmatites. |
IMA Status: |
Valid Species (Pre-IMA) 1866 |
Locality: |
Oxford Co., Maine, USA. Pala, San Diego Co., California, USA. Link to MinDat.org Location Data. |
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Cookeite Image |
Images:
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Cookeite
Comments: Large tan-colored cookeite epimorph after a large 12 cm quartz crystal. The outer faces of the epimorph are overgrown with milky quartz crystals up to 15 mm long.
Location: Bennett & Orchard Pit mines, Buckfield, Oxford Co., Maine, USA.
Scale: 17x17x11 cm.
© John Betts - Fine Minerals |
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Cookeite Crystallography
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Axial Ratios: |
a:b:c =0.5744:1:3.2138 |
Cell Dimensions: |
a = 5.13, b = 8.93, c = 28.7, Z = 4; beta = 98.75° V = 1,299.47 Den(Calc)= 2.67 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a |
X Ray Diffraction: |
By Intensity(I/Io): 2.315(1), 3.52(0.9), 4.7(0.9), |
Crystal Structure:
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Help on Above
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Zheng H , Bailey S W , American Mineralogist , 82 (1997) p.1007-1013, Refinement of the cookeite r structure
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Physical Properties of Cookeite
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Cleavage: |
[001] Perfect |
Color: |
White, Green, Brown, Yellowish white, Pinkish white. |
Density: |
2.67 |
Diaphaniety: |
Transparent to translucent |
Fracture: |
Flexible - Flexible fragments. |
Habit: |
Micaceous - Platy texture with "flexible" plates. |
Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
Hardness: |
2.5 - Finger Nail |
Luminescence: |
Non-fluorescent. |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Cookeite
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Gladstone-Dale: |
CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2185,KPDmeas= 0.2185,KC= 0.2286 |
Optical Data: |
Biaxial (+), a=1.572-1.576, b=1.579-1.584, g=1.589-1.6, bire=0.0170-0.0240 |
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Calculated Properties of Cookeite
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Electron Density: |
relectron=2.68 gm/cc note: rCookeite =2.67 gm/cc. |
Fermion Index |
Fermion Index = 0.00879 Boson Index = 0.99121 |
Photoelectric: |
PECookeite = 1.42 barns/electron U=PECookeite x relectron= 3.79 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cookeite is Not Radioactive |
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Cookeite Classification
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Dana Class: |
71.4.1.2 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.4)interlayered 1:1, 2:1, and octahedra |
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(71.4.1)Chlorite group (Tri-Dioctahedral) |
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71.4.1.1 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m |
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71.4.1.2 Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m |
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71.4.1.3 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m |
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71.4.1.4 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m |
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71.4.1.5 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m |
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71.4.1.6 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri |
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71.4.1.7 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m |
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71.4.1.8 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m |
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71.4.1.9 Orthochamosite! (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho |
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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.23-90 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups |
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VIII/H.23 - Chlorite group |
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VIII/H.23-10 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m |
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VIII/H.23-20 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m |
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VIII/H.23-30 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m |
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VIII/H.23-40 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho |
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VIII/H.23-50 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri |
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VIII/H.23-60 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m |
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VIII/H.23-70 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m |
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VIII/H.23-80 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho |
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VIII/H.23-90 Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m |
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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 |
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VIII/H.23-100 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1 |
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VIII/H.23-110 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2 |
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Other Cookeite Information
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References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Cookeite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 - Minerals of Wisconsin
13 -QUT Mineral Atlas
14 - Scandinavian mineral gallery
15 - WWW-MINCRYST
16 -École des Mines de Paris
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Cookeite
LiAl4(Si3Al)O10(OH)8
Dana No: 71.4.1.2 Strunz No: VIII/H.23-90
Locality:
Notes:
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