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Arsenate

Graulichite-(La)

LaFe³⁺₃(AsO₄)₂(OH)₆
Hardness3.5
Crystal systemHexagonal
ClassArsenate
←PrevGraulichite-(Ce)NextGravegliaite→
Graulichite-(La) specimen

Graulichite-(La), as yellow rhombohedral crystals with thin needles of agardite-(La). Field of view: 0.5 mm. Collection Georges Favreau, photo Pierre Clolus. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( https://creativecommons.org/licenses/by/4.0/ ). — Photo: Pierre Clolus · CC BY-SA 4.0

Graulichite-(La)

Graulichite-(La) is an IMA-recognized mineral species in the arsenate class, with the chemical formula LaFe³⁺₃(AsO₄)₂(OH)₆.

It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Alunite-crandallite structural group.

Key properties: Mohs hardness 3.5; specific gravity 3.907; Light yellow streak; Resinous luster.

IMA symbol Grl-La, IMA status: approved, named in 2021.

Found in a secondary oxidation assemblage in a sulfide deposit.

It is found associated with Agardite-(La), malachite, conichalcite.

The suffix indicates the La analogue of graulichite-(Ce).

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 G minerals or help write this entry.