mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Fersmanite with Aegerine & Albite

#PD40472

Fersmanite with Aegerine & Albite

#PD40472
Availability
Sold
Size
6 x 4 x 3.5 cm - Sm Cabinet 
Formula
Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 (RRUFF)
Locality
Eveslogchorr Mt, Khibiny Massif, Kola Peninsula, Russia
Tagged
pegmatite mineral

Fersmanite was discovered in 1922 at Eveslogchorr Mt, but thought to be just titanite however, it was later found to contain Niobium. It was described in 1926. The mineral was named after the famous Russian mineralogist Aleksandr Evgen'evich Fersman (1883-1945), one of the founders of modern geochemistry.  Fersmanite occurs in this specimen as translucent crystal grains to 8mm with Aegerine, Albite, and possibly Pectolite. It was originally found in aegerine-nepheline-microcline pegmatite vein with lamprophyllite, pectolite, and apatite. The nepheline syenite pegmatites differ from granitic pegmatites in that they are alkali and quartz deficient (silica-undersaturated).

Type Locality

Fersmanite

Formula
Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 
Crystal System
Monoclinic 
Crystal Habit
Pseudo Tetragonal 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
golden yellow, resin brown, light brown, dark brown 
Streak
brownish white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
5.5 

Data courtesy of Webmineral.

Collection
Phillips Collection
Special Info
Type Locality

Other Sold

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2020 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map