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Pachnolite

#41640
SOLD
Pachnolite from Gjerdingselva, Nordmarka, Lunner, Oppland, Norway - 41640
Pachnolite from Gjerdingselva, Nordmarka, Lunner, Oppland, Norway - 41640

Pachnolite

#41640
Availability
Sold
Size
3.5 x 3 x 2 cm - Miniature 
Formula
NaCaAlF6·H2O (RRUFF)
Locality
Gjerdingselva, Nordmarka, Lunner, Oppland, Norway

Tiny colorless micro crystals in a vug unseen in the photos, but visible under the microscope. Pachnolite usually occurs in pegmatites with a fluorine component most notably but not limited to Ivigtut. Such pegmatites often contain fluorite, fluellite, prosopite, topaz, cryolite, ralstonite and other alkali aluminum fluoride granitic bodies which are peraluminous and usually in "NYF" (niobium-yttrium-fluoride) evolved and fractionated pegmatites. In this case Gjerdingselva is not a pematite but is alkali (soda) rich in flourine.

Pachnolite

Formula
NaCaAlF6·H2O 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Twinning Common, Pseudo Orthorhombic 
Cleavage
Poor, None, None 
Luster
Vitreous - Greasy 
Color
colorless, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
3 

Data courtesy of Webmineral.

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