Kentbrooksite

A variety of Minerals

Kentbrooksite specimen - rock identification

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.

Kentbrooksite Market Value Calculator

Estimate the market value of Kentbrooksite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Preview only. Full pricing comps and valuation report in the app.

Kentbrooksite Localities Map

See where Kentbrooksite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview
North ZoneCentral RidgeSouth Basin

Interactive map layers and collecting notes are available in the app.

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
FREE APP
4.7
Ruby Glint rock identifier app

Identify Kentbrooksite Instantly

  • Snap a photo, get instant results
  • 6,700+ rocks, minerals & crystals
  • Discover collecting spots near you

Related Minerals

Explore More Rocks & Minerals