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Silicate

Ferrierite-NH4

(NH₄,Mg₀.₅)₅(Al₅Si₃₁O₇₂)·22H₂O
Crystal systemOrthorhombic
ClassSilicate
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Ferrierite-NH4 specimen

Tan acicular crystals of the extremely rare mineral ferrierite-NH4 (IMA 2017-099) from one of the only three known localities worldwide: Jenišův Újezd, Bílina, Teplice, Ústí nad Labem Region, Czech Republic. — Photo: David Hospital · CC BY-SA 4.0

Ferrierite-NH4

Ferrierite-NH4 is an IMA-recognized mineral species in the silicate class, with the chemical formula (NH₄,Mg₀.₅)₅(Al₅Si₃₁O₇₂)·22H₂O.

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

IMA symbol Frr-NH4, IMA status: approved, named in 2018.

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 F minerals or help write this entry.