Ternovite
Ternovite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula MgNb₄O₁₁·8-12H₂O.
Key properties: specific gravity 3.65; optically uniaxial.
IMA symbol Tno, IMA status: approved, named in 1992.
Found as a very rare late-formed mineral in fractures in lithium-rich pegmatite (Foote mine, North Carolina, USA); on a museum specimen from a metamorphosed Fe–Mn orebody (Långban, Sweden).
It is found associated with Bavenite, eakerite, siderite–rhodochrosite, albite, quartz (Foote mine, North Carolina, USA); magnetite, barite (Långban, Sweden).
As the TETRAgonal dimorph of wickmanite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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