Kentbrooksite
A variety of Minerals
What is Kentbrooksite?
Kentbrooksite is a moderately rare mineral of the eudialyte group, with chemical formula (Na,REE)15(Ca,REE)6Mn3Zr3NbSi[(Si9O27)2(Si3O9)2O2]F2·2H2O. This extended formula shows the presence of cyclic silicate groups and dominance of Si at the M4 site, according to the nomenclature of the eudialyte group. The characteristic features of kentbrooksite, that make it different from eudialyte are: (1) dominancy of fluorine (the only currently known example among the whole group), (2) dominancy of manganese, and (3) dominancy of niobium. Trace hafnium and magnesium are also reported. Kentbrooksite is relatively common when compared to most other species of the group.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Kentbrooksite 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.
Kentbrooksite Localities Map
See where Kentbrooksite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Kentbrooksite
Kentbrooksite was found in alkaline pegmatites within pulaskites of the Kangerdlugssuaq intrusion in East Greenland.
Quick Facts
Physical Properties
- Color
- Yellow-brown
- Hardness (Mohs)
- 5 - 6
- Density
- 3.08 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- (Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O
- Elements
- Ca, F, Fe, H, Mn, Na, Nb, O, Si, Zr
Identify Kentbrooksite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you
Kentbrooksite FAQs
How do I identify Kentbrooksite?
Kentbrooksite can be identified by its hardness of 5 - 6 on the Mohs scale, Yellow-brown color. Look for these key characteristics when examining specimens.
What color is Kentbrooksite?
Kentbrooksite typically appears in Yellow-brown. Color can vary depending on impurities and formation conditions.
How hard is Kentbrooksite?
Kentbrooksite has a hardness of 5 - 6 on the Mohs scale. This gives it moderate hardness.
What is the formation of kentbrooksite of Kentbrooksite?
Kentbrooksite was found in alkaline pegmatites within pulaskites of the Kangerdlugssuaq intrusion in East Greenland.
%252FAbenakiite-(ce)-01.jpg&size=small)
