Hydrated phosphate containing hydroxyl, dufrénite group
Specific gravity: 3.23
Hardness: 3½ to 4½
Colour: Light blue-green
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).
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).
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).
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