Sorosilicate (Si2O7 groups), zirconium mineral
Specific gravity: 3.624 calculated
Hardness: 3½ to 4
Colour: Chalky white
Plutonic igneous environments
At the type locality, the Kipawa alkaline complex, Les Lacs-du-Témiscamingue, Témiscamingue RCM, Abitibi-Témiscamingue, Quebec, Canada, gittinsite occurs in eudialyte - rich pegmatitic lenses in a regionally metamorphosed aluminium-poor syenite complex. Associated minerals include apophyllite, vlasovite, thorite, pectolite, eudialyte, fluorite, graphite, calcite, mosandrite-(Ce), microcline, apatite, agrellite and opal (HOM, Webmin, Mindat). The gittinsite forms fibrous to radiating masses intimately associated with apophyllite and with a maximum length about 0.1 mm (AM 66.1274-1275, Mindat).
At the Pajarito Mountain, Otero county, New Mexico, USA, gittinsite occurs as an alteration product of eudialyte in syenite, quartz syenite and alkalic granite, associated with eudialyte, zircon and chlorite (HOM).
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