Orthojoaquinite-(La)
Orthojoaquinite-(La) is an IMA-recognized mineral species in the silicate class, with the chemical formula NaBa₂Fe²⁺La₂Ti₂(SiO₃)₈O₂(OH,O,F)·H₂O.
It crystallizes in the orthorhombic crystal system (space group Ccmm). It is a member of the Joaquinite structural group.
Key properties: Mohs hardness 5; specific gravity 4.1; Silky luster; optically biaxial.
IMA symbol Ojq-La, IMA status: approved, named in 2000.
Found in the intermediate zone of nepheline-sodalite syenite pegmatite in an alkaline igneous complex.
It is found associated with Riebeckite, analcime, sodalite, steenstrupine-(Ce).
An orthorhombic member of the joaquinite group with La as the dominant rare-earth element.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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