Joaquinite-(Ce)

joaquinite-(Ce)

neptunite

benitoite

natrolite

Images

Formula: NaBa₂Fe²⁺Ti₂Ce₂(Si₄O₁₂)₂O₂(OH).H₂O
Cyclosilicate (ring silicate), joaquinite group
Crystal System: Monoclinic
Specific gravity: 3.89 to 3.98 measured, 3.93 calculated
Hardness: 5 to 5½
Colour: Brown, honey-yellow, orange
Environments:

Pegmatites
Metamorphic environments
Hydrothermal environments

Localities

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).

Back to Minerals