béhierite

{{Infobox mineral | name = Béhierite | category = Borate | boxwidth = | boxbgcolor = | image = Behierite-70408.jpg | imagesize = | caption = | formula = TaBO4 |IMAsymbol=Béh | molweight = | strunz = 6.AC.15 | dana = | system = Tetragonal | class = Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m) | symmetry = I41/amd | unit cell = a = 6.21, c = 5.47 [Å] (approximated); Z = 4 | color = | habit = pseudo-octahedral | twinning = | cleavage = {110} and {010}, distinct | fracture = Subconchoidal | tenacity = | mohs = 7-7.5 | luster = | polish = | refractive = nω & nε >2 | opticalprop = Uniaxial (+) | birefringence = High | 2V = | dispersion = | pleochroism = | fluorescence= | absorption = | streak = | gravity = | density = 7.91 (calc.), 7.86 (meas.) | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = | other = | references = }}

Béhierite is a very rare borate mineral, and the tantalum endmember of a solid solution series formed with schiavinatoite, its niobium analogue.