Eudialyte
Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
Mineral NameEudialyte
Chemical FormulaNa₁₅Ca₆(Fe²⁺,Mn²⁺)₃Zr₃[Si₂₅O₇₃](O,OH,H₂O)₃(Cl,OH)₂
Mohs Hardness5
Crystal Systemtrigonal
Lusterdull
Streak Colorwhite
Cleavageimperfect on {0001}
Fractureconchoidal to uneven
Specific Gravity2.9
Colorsmagenta, red, pink, brown
Transparencytranslucent to opaque
Type LocalityPutelichorr, Khibiny Massif, Kola Peninsula, Russia
Mineral Groupcyclosilicates
Usescollector, gemstone, zirconium ore
Associated Mineralsaegirine, nepheline, feldspar, arfvedsonite
Rarityrare
Description
A magenta-colored eudialyte crystal, approximately 2 cm across, exhibiting a matte luster and perched on a dark, massive matrix.
Geological Context
Eudialyte forms in peralkaline igneous rocks, particularly nepheline syenites and related pegmatites, characteristic of alkali intrusions like the Khibiny Massif.
