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Silicate

Manganoneptunite

KNa₂LiMn²⁺₂Ti₂Si₈O₂₄
Crystal systemMonoclinic
ClassSilicate
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Manganoneptunite specimen

Manganoneptunite Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire , Rouville RCM, Montérégie , Québec , Canada ( Locality at mindat.org ) A remarkable thumbnail! It is a 2.5 cm tall specimen with a wonderful, deep red 1.3 cm neptunite crystal showing exceptional form. Ex Marcelle and Charles Weber Collection. 2.6 x 2.0 x 1.7 cm — Photo: Robert M. Lavinsky · CC BY-SA 3.0

Manganoneptunite

The manganese-dominant end of the neptunite series — a black titanium-bearing silicate of alkaline intrusions.

Intro adapted from Wikipedia (CC BY-SA).

Manganoneptunite is an IMA-recognized mineral species in the silicate class, with the chemical formula KNa₂LiMn²⁺₂Ti₂Si₈O₂₄.

It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Neptunite structural group.

IMA symbol Mnnpt, IMA status: approved, named in 1923.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet. Browse more M minerals or help write this entry.