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Carbonate

Parisite-(La)

CaLa₂(CO₃)₃F₂
Hardness4–5
Crystal systemMonoclinic
ClassCarbonate
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Parisite-(La) specimen

Parisite-(La , Bastnäsite-(La) Dimensions: 50mm x 35mm x 35mm Locality: Mula claim, Tapera, Novo Horizonte, Bahia, Brazil Description: One of the best samples of the new mineral parisite-(La). Luiz Menezes collection. — Photo: Ricardo Scholz · Public domain

Parisite-(La)

Parisite-(La) is mineral discovered by Daniel Atencio of the University of São Paulo and colleagues in the Mula claim, Bahia, Brazil. Parisite-(La) is the lanthanum analog of parisite-(Ce), which has the same structure, but with cerium substituted for lanthanum. Parisite-(La) is chemically similar to synchysite-(La). The type material for parisite-(La) resides in the mineralogical collections of the Museu de Ciência e Técnica, Escola de Minas, Universidade Federal de Ouro Preto, Minas Gerais, Brazil, and at the University of Arizona Mineral Museum, Tucson, Arizona.

Intro adapted from Wikipedia (CC BY-SA).

Parisite-(La) is an IMA-recognized mineral species in the carbonate class, with the chemical formula CaLa₂(CO₃)₃F₂.

It crystallizes in the monoclinic crystal system. It is a member of the Parisite structural group.

Key properties: Mohs hardness 4–5; specific gravity 4.273; White streak; Vitreous to dull luster.

IMA symbol Pst-La, IMA status: approved, named in 2016.

Found in brecciated, hydrothermal quartz veins cemented by chalcedony hosted by metarhyolite formed as a result of peraluminous and alkaline magmatism during continental rifting.

It is found associated with Almedaite, hematite, rutile, fluocerite-(Ce), brockite, monazite-(La), rhabdophane-(La), bastnasite-(La).

Designates the La-dominant analogue of parisite-(Ce).

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet. Browse more P minerals or help write this entry.