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Mineralati

Minerals

Kentbrooksite

kentbrooksite

(Na,REE)15(Ca,REE)6(Mn²⁺,Fe²⁺)3Zr3Nb[Si25O74]F2 * 2H2O

Kentbrooksite Mineral Specimen For Sale

Kentbrooksite Mineral Specimen For Sale — via www.dakotamatrix.com · Source

Overview

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.

Scientific references

  1. Kentbrooksite — Wikidata. https://www.wikidata.org/wiki/Q3814677 Link
  2. Kentbrooksite — Wikipedia. https://en.wikipedia.org/wiki/Kentbrooksite Link