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.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Feklichevite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
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
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Feklichevite FAQs
How do I identify Feklichevite?
Feklichevite can be identified by its hardness of 5.5 on the Mohs scale, Dark brown. color. Look for these key characteristics when examining specimens.
What color is Feklichevite?
Feklichevite typically appears in Dark brown.. Color can vary depending on impurities and formation conditions.
How hard is Feklichevite?
Feklichevite has a hardness of 5.5 on the Mohs scale. This gives it moderate hardness.
What is the formation of feklichevite 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.
