Ferri-kaersutite
A variety of Kaersutite Root Name Group
What is Ferri-kaersutite?
Kaersutite is a dark brown to black double chain calcic titanium bearing amphibole mineral with formula: NaCa2(Mg3TiAl)(Si6Al2)O22(OH)2. Ferro-kaersutite is the divalent iron rich endmember of the kaersutite group, with the iron replacing magnesium in the structure. It occurs as phenocrysts in alkalic volcanic rocks; in nodules of peridotite and gabbro in alkalic basalts; in syenites, monzonites and carbonatite tuffs. Mineral association includes titanian augite, rhoenite, olivine, ilmenite, spinel, plagioclase and titanian pargasite. It was first described in 1884 and is named for Qaersut (formerly Kaersut), Umanq district in northern Greenland.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Ferri-kaersutite 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.
Ferri-kaersutite Localities Map
See where Ferri-kaersutite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Brown
Chemical Properties
- Chemical Formula
- NaCa2(Mg3Fe3+Ti)(Al2Si6O22)O2 The Kaersutite group minerals are WO2- dominant amphiboles defined with : A(Na+K+2Ca)> 0.5 apfu, B: Ca dominant CTi > 0.5 apfu and WO > 1.0 apfu Ferri-kaersutite is defined with A position: Na dominant C2+ position: Mg dominant C3+ position: Fe dominant
- Elements
- Al, Ca, Fe, Mg, Na, O, Si, Ti
Identify Ferri-kaersutite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you
Ferri-kaersutite FAQs
How do I identify Ferri-kaersutite?
Ferri-kaersutite can be identified by its Brown color. Look for these key characteristics when examining specimens.
What color is Ferri-kaersutite?
Ferri-kaersutite typically appears in Brown. Color can vary depending on impurities and formation conditions.