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Formula: CeOF
Fluoride, cerium-bearing mineral
Crystal System: Isometric
Specific gravity: 5.890 calculated
Streak: White
Colour: Cream
Environments
Håleniusite-(Ce) is a new mineral, approved in 2021.
Localities
At the type locality, the Água de Pau Volcano, São Miguel, Azores, Portugal, håleniusite-(Ce) was discovered
in ejectum from the volcano. It occurs as opaque, cream-colored, fine-grained
pseudomorphic replacements of hexagonal tablets of
bastnäsite-(Ce). It is associated with
astrophyllite and
fluornatropyrochlore in a matrix composed mainly of
albite, quartz and
aegirine.
(CM 60.713-717).
The Água de Pau Volcano is a stratovolcanic complex, located in the central part of the island of São
Miguel, in the Portuguese archipelago of the Azores
(Mindat).
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