Cyclosilicate (ring silicate), joaquinite group
Specific gravity: 3.62 to 3.98
Hardness: 5 to 5½
Colour: Brown, honey-yellow, orange
At Seal Lake, Canada, joaquinite-(Ce) occurs in gneiss and alkali syenite, associated with aegirine, barylite, eudidymite and neptunite (HOM).
At the Ilimaussaq alkaline massif, south Greenland, joaquinite-(Ce) occurs in nepheline syenite pegmatites (AM52.1762).
At the type locality, the Dallas Gem mine, San Benito county, California, USA, joaquinite-(Ce) occurs in a natrolite vein cutting a glaucophane schist inclusion in a serpentinite body, associated with orthojoaquinite-(Ce), benitoite, neptunite and natrolite (HOM, AM 52.1762).
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