Cyclosilicate (ring silicate)
Specific gravity: 3.62 to 3.98
Hardness: 5 to 5½
Colour: Brown, honey-yellow, orange
At Seal Lake, Canada, joaquinite occurs in gneiss and alkali
syenite, associated with aegirine,
barylite, eudidymite and
At the Ilimaussaq alkaline massif, south Greenland, joaquinite occurs in nepheline syenite pegmatites (AM52.1762).
At the type locality, the Dallas Gem mine, San Benito county, California, USA, joaquinite 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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