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Silicate

Perettiite-(Y)

Y₂Mn²⁺₄Fe²⁺Si₂B₈O₂₄
Hardness7
Crystal systemOrthorhombic
ClassSilicate
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Perettiite-(Y)

Perettiite-(Y) is a complex silicate–borate mineral with the formula Y2Mn4FeSi2B8O24. It was first discovered in 2015 by Adolf Peretti of the Gemresearch Swisslab (GRS). It was found as inclusions in a phenakite crystal from Mogok, Myanmar. Perettiite-(Y) was approved for IMA (International Mineralogical Association) status in 2015.

Intro adapted from Wikipedia (CC BY-SA).

Perettiite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula Y₂Mn²⁺₄Fe²⁺Si₂B₈O₂₄.

It crystallizes in the orthorhombic crystal system (space group Pmna). It is a member of the Perettiite structural group.

Key properties: Mohs hardness 7; specific gravity 4.533; Colorless streak; Vitreous luster; optically biaxial.

IMA symbol Ptt-Y, IMA status: approved, named in 2014.

Occurs as inclusions in gemmy phenakite crystals from pockets in granitic pegmatite.

It is found associated with Schorl, tusionite, columbite-(Mn), albite, fluorapatite, lazulite.

The mineral was named to honor mineralogist and gemologist Adolf Peretti (b. 1957), mineralogist and Head of GRS GemResearch Swisslab AG, Switzerland, who first recognized inclusions in phenakite.

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