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Arsenate

Armellinoite-(Ce)

Ca₄Ce⁴⁺(AsO₄)₄·H₂O
Hardness3–3.5
Crystal systemTetragonal
ClassArsenate
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Armellinoite-(Ce)

Armellinoite-(Ce) is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₄Ce⁴⁺(AsO₄)₄·H₂O.

It crystallizes in the tetragonal crystal system (space group I4_1/a). It is a member of the Pottsite structural group.

Key properties: Mohs hardness 3–3.5; specific gravity 4.29; White streak; Resinous to vitreous luster; optically uniaxial.

IMA symbol Aml-Ce, IMA status: approved, named in 2018.

Found in Fe-Mn ore in metaquartzites.

It is found associated with Quartz, hematite, cryptomelane/hollandite, tilasite, muscovite, braunite, montmorillonite.

The mineral was named to honor Gianluca Armellino (b. 1962), Millesimo, Savona province, Liguria, Italy, who first found more than 40 mineral species new for the Liguria region including this species.

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 A minerals or help write this entry.