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Silicate

Pitiglianoite

K₂Na₆(Si₆Al₆)O₂₄(SO₄)·2H₂O
Hardness5
Crystal systemHexagonal
ClassSilicate
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Pitiglianoite specimen

Pitiglianoite is a extremely rare mineral only known worlwide from three localities in Latium and Tuscany. It occurs in this specimen as sharp colorless crystals associated to minoritary afghanite. From: Grosseto, Tuscany, Italy. — Photo: David Hospital · CC BY-SA 4.0

Pitiglianoite

Pitiglianoite is an IMA-recognized mineral species in the silicate class, with the chemical formula K₂Na₆(Si₆Al₆)O₂₄(SO₄)·2H₂O.

It crystallizes in the hexagonal crystal system (space group P6_3). It is a member of the Cancrinite, Cancrinite-sodalite structural group.

Key properties: Mohs hardness 5; specific gravity 2.37; White streak; Vitreous luster; optically uniaxial.

IMA symbol Pgl, IMA status: approved, named in 1990.

Found in metasomatized blocks of volcanic ejecta.

It is found associated with Apatite, diopside, grossular.

The name is derived from the locality at Pitigliano, Italy.

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