| KNa2Li(Fe,Mg,Mn)2Ti2Si8O24
Neptunite is is a silicate which contains titanium and manganese but it has the additional distinction of containing the element lithium. Its composition is KNa2Li(Fe,Mg,Mn)2Ti2Si8O24.
The large sample above from San Benito County, California. It is about 13x16 cm. The section at left shows more detail about the crystal formation.
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