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Silicate

Nordite-(La)

Na₃SrLaZnSi₆O₁₇
Hardness5–6
Crystal systemOrthorhombic
ClassSilicate
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Nordite-(La)

Nordite-(La) is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₃SrLaZnSi₆O₁₇.

It crystallizes in the orthorhombic crystal system (space group Pcca). It is a member of the Nordite structural group.

Key properties: Mohs hardness 5–6; specific gravity 3.43–3.48; White streak; Vitreous, greasy on fracture luster; optically biaxial.

IMA symbol Nor-La, IMA status: approved, named in 1941.

Extremely rare in pegmatites in sodalite syenite in a differentiated alkalic massif.

It is found associated with Sodalite, ussingite, murmanite, chkalovite, belovite, steenstrupine, lomonosovite, eudialyte, microcline, nepheline, aegirine, sphalerite, neptunite.

The name comes from the mineral's \northern origin" and lanthanum content.

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 N minerals or help write this entry.