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Greenalite with Stilpnomelane

#RW48547
SOLD
Greenalite from Thunderbird South mine, Virginia, St. Louis Co., Minnesota, United States - RW48547
Greenalite from Thunderbird South mine, Virginia, St. Louis Co., Minnesota, United States - RW48547

Greenalite with Stilpnomelane

#RW48547
Availability
Sold
Size
9.5 x 7.5 x 1 cm - Cabinet 
Formula
(Fe2+,Fe3+)2-3Si2O5(OH)4 (RRUFF)
Locality
Thunderbird South mine, Virginia, St. Louis Co., Minnesota, United States

Greenalite is a primary phase of banded iron formations of the serpentine group. This specimen represents this well and is associated with Stilpnomelane. It is relatively hard, shiny and folded.

 

Greenalite

Formula
(Fe2+,Fe3+)2-3Si2O5(OH)4 
Crystal System
Monoclinic 
Crystal Habit
Oolitic, Microscopic Crystals 
Cleavage
None, None, None 
Luster
Earthy (Dull) 
Color
blue green, light yellow green, dark green, black 
Streak
greenish gray 
Class
Monoclinic 
Hardness
2.5 

Data courtesy of Webmineral.

Collection
Robert J. Waidler Collection
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