cookeite
Sign in to saveCookeite is a mineral species of the silicate group and the phyllosilicate subgroup, part of the chlorite family, with the formula LiAl4(Si3Al)O10(OH)8. This soft, low-density mineral of variable color has a crystalline structure made up of alternating layers LiAl2(OH)6 and Al2O4(OH)2Si8O12 having several polytypes. Cookeite is often found as a product of hydrothermal alteration of silicates in pegmatites. It forms at relatively low temperatures (below 200°C) and variable pressures.
In the Vinony graph
Within Vinony's link graph, cookeite is referenced by 73 other articles, and connects out to chlorite group, serpentine mineral subgroup and lepidolite.
Vinony files it under Chlorite group, Lithium minerals and Monoclinic minerals.
Its subject is documented across 8 Wikipedia language editions.
Wikidata facts
- Subclass of
- chlorite group
- Named after
- Josiah P. Cooke
- Image
- Cookeite-gem7-37a.jpg
Show 7 more facts
- Nickel-Strunz 9th edition (updated 2009)
- 9.EC.55
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.EC.55
- Commons category
- Cookeite
- Commons gallery
- Cookeite
- IMA Mineral Symbol
- Ckt
- chemical formula
- (Al,Li)₃Al₂(Si,Al)₄O₁₀(OH)₈
- Strunz 8th edition (series ID, updated)
- VIII/E.09a
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Encyclopedic overview
19 sectionsContents
- History
- Inventor and etymology
- Topotype
- Physico-chemical properties
- Determination criteria
- Chemical composition
- Crystallochemistry
- Crystallography
- Overview
- Cookeite r
- Other cookeites
- Mineral deposits
- Geology and associated minerals
- Productive deposits of remarkable specimens
- Mineral growth
- Notes
- References
- Appendix
- Bibliography
{{Infobox mineral|name=Cookeite|image=Cookeite.jpg|caption=Cookeite on quartz, Paris, Maine, topotype deposit|category= Phyllosilicate minerals|group=Chlorite group|formula=|strunz=09.EC.55|system=monoclinic|dana=71.04.01.02|class=prismatic;C2 or Cc|color=white, green, brown, golden, pink|twinning=around [310]|cleavage=perfect over {001}|fracture=flexible|tenacity=2,5|luster=pearly; silky|refractive=α = 1,572–1,576, β = 1,579–1,584, γ = 1,589–1,6|birefringence=biaxial (+), 0,0170–0,02402V = 35 to 60°|pleochroism=x = y: pale green to pink, z: colorless to pale yellow|fluorescence=cream yellow (SW)|density=from 2.58 to 2.69}}
Cookeite is a mineral species of the silicate group and the phyllosilicate subgroup, part of the chlorite family, with the formula LiAl4(Si3Al)O10(OH)8. This soft, low-density mineral of variable color has a crystalline structure made up of alternating layers LiAl2(OH)6 and Al2O4(OH)2Si8O12 having several polytypes. Cookeite is often found as a product of hydrothermal alteration of silicates in pegmatites. It forms at relatively low temperatures (below 200°C) and variable pressures.
Excerpted from Wikipedia’s “cookeite” article, available under the CC BY-SA 4.0 licence.
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