kentbrooksite
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Kentbrooksite is a moderately rare mineral of the eudialyte group, with chemical formula . 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
Wikidata facts
- Image
- Terskite & Kentbrooksite.jpg
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- IMA Mineral Symbol
- Ktb
- chemical formula
- (Na,REE)₁₅(Ca,REE)₆(Mn²⁺,Fe²⁺)₃Zr₃Nb[Si₂₅O₇₄]F₂ * 2H₂O
- Nickel-Strunz 9th edition (updated 2009)
- 9.CO.10
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.CO.10
- Commons category
- Kentbrooksite
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Article
3 sectionsContents
- Occurrence
- Notes on chemistry
- References
Kentbrooksite is a moderately rare mineral of the eudialyte group, with chemical formula . 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.
==Occurrence== Kentbrooksite was found in alkaline pegmatites within pulaskites of the Kangerdlugssuaq intrusion in East Greenland.