Tantite

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| name = Tantite

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| category = Oxide minerals

| formula = Ta₂O₅

| IMAsymbol = Tan{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

| molweight = 441.89 g/mol

| strunz = 4.EA.05

| dana = 04.06.06.01

| system = Triclinic

| class = Pedial (1)
(same H-M symbol)

| symmetry = P1

| unit cell = a = 3.8 Å, b = 3.79 Å
c = 35.74 Å; β = 90.18°; Z = 6

| color = Colorless

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| cleavage = None

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| mohs = 7

| luster = Adamantine

| streak = White

| diaphaneity = Transparent

| gravity = 8.55

| density = {{val|8.45|ul=g/cm3}}

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| opticalprop = Biaxial

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| references = {{cite web|title=Tantite mineral information and data|url=http://www.mindat.org/min-3884.html|publisher=Mindat.org|accessdate=2011-11-01}}{{cite web|title=Tantite Mineral Data|url=http://www.webmineral.com/data/Tantite.shtml|publisher=Webmineral.com|accessdate=2011-11-01}}

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Tantite is a rare tantalum oxide mineral with formula: Ta₂O₅. Tantite forms transparent microscopic colorless triclinic - pedial crystals with an adamantine luster. It has a Mohs hardness of 7 and a high specific gravity of 8.45. Chemical analyses show minor inclusion (1.3%) of niobium oxide.

It was first described in 1983 for an occurrence in a pegmatite in the Kola peninsula, Russia. It has also been reported from a pegmatite complex in Florence County, Wisconsin. Associated mineral species include elbaite, lepidolite, spodumene, columbite-tantalite, wodginite, and microlite.