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Formula: NaFe2+Fe3+5(PO4)4(OH)6.2H2O
Hydrated phosphate containing hydroxyl, dufrénite group
Crystal System: Monoclinic
Specific gravity: 3.20 measured, 3.23 calculated
Hardness: 3½ to 4½
Streak: Green
Colour: Light blue-green
Environments
Natrodufrénite ia a low-temperature secondary mineral associated with
cyrilovite and goethite (Webmin,HOM).
At Kintore, Broken Hill, Yancowinna county, New South Wales, Australia, natrodufrénite occurs in cavities in etched
quartzite associated with jarosite and
turquoise-chalcosiderite, also as coatings
on fractures in garnet sandstone
(AJM 3.1.50).
At the Moculta Phosphate Quarry, Angaston, Barossa Valley, Mount Lofty Ranges, South Australia, natrodufrénite is often overgrown with
wavellite, cyrilovite and
variscite (AJM 17.1.23-24).
At Tom's Quarry, Kapunda, Mount Lofty Ranges, South Australia, natrodufrénite is associated with
leucophosphite, meurigite-Na,
cacoxenite and kapundaite
(AJM 17.1.23-24).
Natrodufrénite from Tom's Quarry - Image
At the Fairview Quarry, Robertstown, Mount Lofty Ranges, South Australia, natrodufrénite is associated with
wavellite and cyrilovite
(AJM 17.1.23-24).
Near Campbell's Creek, Mount Alexander Shire, Victoria, Australia, natrodufrénite occurs in
sandstone and quartzite, associated
with cyrilovite and goethite
(AJM 13.2.68).
Natrodufrénite from Campbell's Creek -
Image
At the type locality, Pluherlin Castle, Rochefort-en-Terre, Morbihan, Brittany, France, natrodufrénite occurs in
limonite with cyrilovite and
goethite (Dana); these minerals were formed simultaneously by low temperature,
supergene alteration
(AM 68.1039).
Natrodufrénite from Pluherlin Castle -
Image
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