Olmsteadite

Facts

Chemical formula

KFe²⁺₂(Nb₅+,Ta₅+)(PO₄)₂O₂ * 2H₂O

Mohs hardness

4.0

Elements in formula

Potassium, Iron, Niobium, Tantalum, Phosphorus, Oxygen, Hydrogen

Number of elements

7

IMA status

Approved

Named after

Milo C. Olmstead

Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q1284099