Frankamenite
A variety of Canasite Group
What is Frankamenite?
Frankamenite is the fluorine-dominate variation of the rare mineral canasite with a general formula of K3Na3Ca5(Si12O30)[F,(OH)]4·(H2O). Frankamenite belongs to the triclinic crystal system, with the bases of its structure containing Ca-Na mixed octahedra joined by octagonal tubes SiO4 of the composition (Si12O30). Frankamenite has six Ca-Na mixed positions distributed amongst these octahedra, reflecting its varying compositions. Frankamenite was named for the Russian mineralogist-crystallographer V. A. Frank-Kamentsky (1915–1994), who discovered the mineral. Frankamenite occurs in association with the rare mineral charoite, which is found only in the Aldan Shield, Sakha Republic, Yakutia, Siberia, Russia. Here, metasomatism enriches a syenite massif with potassium when it comes into contact with a limestone at around 200–250 °C. This metamorphic process produces a potassium feldspar metasomatite, the typical geological environment for canasite and, therefore, frankamenite. Frankamenite and charoitein are exclusive to the Sakha Republic in this sort of environment, as mineralogists have yet to discover the minerals elsewhere.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Frankamenite 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.
Frankamenite Localities Map
See where Frankamenite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Grayish lilac, bluish gray, or light green
- Hardness (Mohs)
- 5.5
- Streak
- White
Chemical Properties
- Chemical Formula
- K3Na3Ca5(Si12O30)(F,OH)4 · H2O
- Elements
- Ca, F, H, K, Na, O, Si
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Frankamenite FAQs
How do I identify Frankamenite?
Frankamenite can be identified by its hardness of 5.5 on the Mohs scale, Grayish lilac color. Look for these key characteristics when examining specimens.
What color is Frankamenite?
Frankamenite typically appears in Grayish lilac, bluish gray, or light green. Color can vary depending on impurities and formation conditions.
How hard is Frankamenite?
Frankamenite has a hardness of 5.5 on the Mohs scale. This gives it moderate hardness.