Fersmanite with Aegerine & Albite
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Fersmanite with Aegerine & Albite
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- 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
- Mineralpedia
- View Fersmanite
- On Dakota Matrix
- Previously Sold Fersmanite
- On Dakota Matrix
- Other Available Fersmanite
- WebMineral
- View Fersmanite
- Mindat
- View Fersmanite
