description Neptunite Overview
Neptunite is an approved silicate mineral with the formula KNa2LiFe2+2Ti2Si8O24. It commonly forms black to dark-red monoclinic crystals and is associated with alkaline pegmatites; its type locality is the Narsaarsuk pegmatite in Greenland, where it was first published in 1893. In California it is notably found with benitoite in natrolite veins, making it a mineral of interest to collectors.
help Neptunite FAQ
What is the chemical formula of neptunite?
Neptunite has the formula KNa2LiFe2+2Ti2Si8O24. It is an approved silicate mineral containing potassium, sodium, lithium, iron, titanium, silicon, and oxygen.
What color is neptunite?
Neptunite commonly forms black to dark-red monoclinic crystals. Its strong dark color and crystal shape make it distinctive in mineral collections.
Where was neptunite first published from?
The type locality is the Narsaarsuk pegmatite in Greenland. The mineral was first published in 1893.
What kind of crystal system does neptunite have?
Neptunite crystallizes in the monoclinic system. It is associated with alkaline pegmatites, where its dark crystals can occur with other unusual minerals.
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