Feklichevite
A variety of Eudialyte group
What is Feklichevite?
Feklichevite is a rare mineral of the eudialyte group with the formula Na11Ca9(Fe,Fe)2Zr3NbSi(Si3O9)2(Si9O27)2. The original formula was extended to show the presence of cyclic silicate groups and presence of silicon at the M4 site, according to the nomenclature of eudialyte group. When compared to other minerals of the group, feklichevite characterizes in the presence of ferric iron (thus similar to ikranite, mogovidite and fengchengite) and dominance of calcium at the N4 site. Calcium is ordered in the structure and is also present at the M1 site. Other iron-bearing minerals of the group are eudialyte, ferrokentbrooksite, georgbarsanovite, khomyakovite, labyrinthite, oneillite and rastsvetaevite, but they rather contain ferrous iron Feklichevite name honors Russian mineralogist and crystallographer, V. G. Feklichev.
Feklichevite Market Value Calculator
Estimate the market value of Feklichevite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Feklichevite Localities Map
See where Feklichevite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Feklichevite
Feklichevite was found in cancrinite syenite vein of pegmatoid type, that occurs in the Kovdor alkaline massif, Kola Peninsula, Russia. Feklichevite coexists with aegirine-diopside, cancrinite, potassic feldspar, pectolite, titanite, hematite, and руrrhоtitе.
Quick Facts
Physical Properties
- Color
- Dark brown.
- Hardness (Mohs)
- 5.5
- Density
- 2.869 g/cm³
- Streak
- Brownish
Chemical Properties
- Chemical Formula
- Na11Ca9(Fe3+,Fe2+)2Zr3NbSi25O735
- Elements
- Ca, Cl, Fe, H, Na, Nb, O, Si, Zr
Identify Feklichevite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you
