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Carbonate

Arisite-(La)

NaLa₂(CO₃)₂[F₂ₓ(CO₃)₁₋ₓ]F
Hardness3.5
Crystal systemHexagonal
ClassCarbonate
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Arisite-(La)

Arisite-(La) is an IMA-recognized mineral species in the carbonate class, with the chemical formula NaLa₂(CO₃)₂[F₂ₓ(CO₃)₁₋ₓ]F.

It crystallizes in the hexagonal crystal system (space group P-6m2). It is a member of the Arisite structural group.

Key properties: Mohs hardness 3.5; specific gravity 3.3; White streak; Vitreous luster; optically uniaxial.

IMA symbol Ari-La, IMA status: approved, named in 2009.

A late-stage, post-magmatic to hydrothermal mineral in miarolitic cavities as La-rich cores in arisite-(Ce) from phonolite in association with an alkaline volcanic province.

It is found associated with Villiaumite, aegirine, analcime, apatite, fluorite, manganoneptunite, microcline, natrolite, sphalerite, tuperssuatsiaite, the Fe-analogue of zakharovite.

The La-dominant analog of arisite-(Ce), which is named for the Aris phonolite, Namibia.

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.