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Silicate

Chiappinoite-(Y)

Y₂Mn(Si₃O₇)₄
Hardness6
Crystal systemOrthorhombic
ClassSilicate
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Chiappinoite-(Y) specimen

Chiappinoite-(Y) Field of view: 0.6 mm Locality: Pumice quarry, Ribeira Grande, São Miguel, Azores, Portugal ( locality at mindat.org ) — Photo: Henk Smeets – tomeikminerals.com · CC BY 4.0

Chiappinoite-(Y)

Chiappinoite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula Y₂Mn(Si₃O₇)₄.

It crystallizes in the orthorhombic crystal system (space group Ibam).

Key properties: Mohs hardness 6; specific gravity 3.09; White streak; Vitreous luster; optically biaxial.

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

Found in vugs in a block of peralkaline syenitic volcanic ejectum.

It is found associated with Astrophyllite, dalyite, elpidite, fluornatropyrochlore, kentbrooksite, albite, quartz, aegirine.

The mineral was named to honor Luigi Chiappino (b. 1950), a distinguished mineral collector of Milan, Italy, who discovered the first specimen.

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 C minerals or help write this entry.