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0 item @ $0.00  

Cookeite with Elbaite tourmaline

#PD31880

Cookeite with Elbaite tourmaline

#PD31880
Availability
Sold
Size
8 x 6 x 6 cm - Sm Cabinet 
Formula
(Al,Li)3Al2(Si,Al)4O10(OH)8 (RRUFF)
Locality
Portland, Middlesex Co., Connecticut, United States
Tagged
pegmatite mineral

A large mass of pegmatitic nature with light green Elbaite, purple Lepidolite, Microcline and Cookeite (light brown). Cookeite is a chlorite group member with lithium and is typically found as a late stage alteration product probably by hydrothermal activity within granitic lithium-rich pegmatites.

Cookeite

Formula
(Al,Li)3Al2(Si,Al)4O10(OH)8 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Pseudo Hexagonal 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
white, green, brown, yellowish white, pinkish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Flexible 
Hardness
2.5 

Data courtesy of Webmineral.

Collection
Phillips Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Cookeite
On Dakota Matrix
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WebMineral
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