Perettiite-(Y)

Perettiite-(Y) is a complex silicate–borate mineral with the formula Y₂Mn₄FeSi₂B₈O₂₄.^[3] 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.^[5]

Perettiite-(Y)
Perettiite inclusion in phenakite
General
Category	Silicate mineral
Formula	Y2Mn4FeSi2B8O24
IMA symbol	Ptt-Y[1]
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space group	Pmna
Unit cell	a = 12.8252(5) Å, b = 4.6187(2) Å, c = 12.8252(5) Å; Z = 2
Identification
Crystal habit	Microscopic inclusion
Cleavage	(010)
Mohs scale hardness	7
Specific gravity	4.533
References	[2][3][4]

Perettiite-(Y) was approved for IMA (International Mineralogical Association) status in 2015.

Perettiite inclusion in a phenakite crystal