Those minerals have same chemical composition but different crystal symmetry : orthorhombic for columbite and tetragonal for tapiolite.
4.
Those minerals have same chemical composition, but different crystal symmetry orthorhombic for tantalite and tetragonal for tapiolite.
5.
Those minerals have the same chemical composition, but different crystal symmetry orthorhombic for tantalite or columbite and tetragonal for tapiolite.
6.
It occurs in association with tantalite, manganotantalite, microlite, tapiolite, beryl, spodumene, montebrasite, pollucite, petalite, eucryptite, tourmaline, muscovite and quartz.
7.
The minerals have a submetallic luster and a high specific gravity with tapiolite-Fe having a higher specific gravity ( 7.90 ) versus 7.72 for tapiolite-Mn.
8.
The minerals have a submetallic luster and a high specific gravity with tapiolite-Fe having a higher specific gravity ( 7.90 ) versus 7.72 for tapiolite-Mn.
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