Olgite

Olgite is a rare blue-green colored phosphate mineral series that forms microscopic prismatic crystals that are trigonal in structure. Its chemical formula is Na(Sr,Ba)PO₄.^[1]

Olgite
Very dark green crystals of the rare phosphate mineral olgite from the type locality in Kola (Karnasurt Mountain, Lovozero Massif, Murmansk Oblast, Russian Federation)
General
Category	Minerals
Formula	Na(Sr,Ba)PO4
Identification
Color	Blue-green

Olgite was discredited as a mineral name in 2008 by the International Mineralogical Association and is now the series name for bario-olgite and strontio-olgite (hypothetical mineral).^[2][3] The substance was named after Russian mineralogist Olga Anisimovne-Vorobiova (1902–1974).