Editing Columbite (section)

== Columbite species ==
[[File:Yttrocolumbite-(Y)-796200.jpg|left|thumb|Yttrocolumbite; a species of columbite|146x146px]]
Columbite forms opaque crystals that are black to dark brown in colour.<ref name=":1">{{Cite journal |last1=Siachoque |first1=Astrid |last2=Garcia |first2=Rodolfo |last3=Vlach |first3=Silvio R.F. |date=2020-05-04 |title=Occurrence and Composition of Columbite-(Fe) In the Reduced A-Type Desemborque Pluton, Graciosa Province (S-SE Brazil) |journal=Minerals |language=en |volume=10 |issue=5 |pages=411 |doi=10.3390/min10050411 |doi-access=free |bibcode=2020Mine...10..411S |issn=2075-163X}}</ref> The formation of the crystals vary based on the species present.

Columbite forms a series with the [[tantalum]]-dominant analogue [[ferrotantalite]] and the manganese-dominant analogue '''manganocolumbite'''. Manganocolumbite has a chemical formula of (Mn, Fe)(Nb, Ta)<sub>2</sub>O<sub>6</sub>, often with small concentrations of tantalum and iron. Manganocolumbite is often found in pegmatites, course-grained igneous rocks.<ref name=":1" />[[File:Ferrocolumbite-pb50a.jpg|left|thumb|182x182px|Ferrocolumbite; a species of columbite]]

The iron-rich member of the columbite group is '''ferrocolumbite,''' FeNb<sub>2</sub>O<sub>6</sub>, and small concentrations of [[tin]] and [[tungsten]] may be present. This species of columbite is often found in pegmatites as course-grained igneous rocks.<ref name=":1" />

'''Yttrocolumbite''' is the [[yttrium]]-rich columbite with the formula {{chem|(Y|,U|,Fe)|(Nb|,Ta)|O|4}}, is a [[radioactive]] mineral found in [[Mozambique]].<ref>{{Cite journal |last1=Abdel Gawad |first1=Ahmed E. |last2=Ali |first2=Khaled |last3=Eliwa |first3=Hassan |last4=Sayyed |first4=M. I. |last5=Khandaker |first5=Mayeen Uddin |last6=Bradley |first6=David A. |last7=Osman |first7=Hamid |last8=Elesawy |first8=Basem H. |last9=Hanfi |first9=Mohamed Y. |date=2021-12-07 |title=Radiological Investigation on Sediments: A Case Study of Wadi Rod Elsayalla the Southeastern Desert of Egypt |journal=Applied Sciences |language=en |volume=11 |issue=24 |pages=11884 |doi=10.3390/app112411884 |issn=2076-3417 |doi-access=free}}</ref> This mineral forms due to pegmatites and rare-metal granites.<ref name=":1" />