Specific gravity: 3.2
Hardness: 2½ to 3
Streak: Dark brown
Colour: Black, brownish, violet
At the type locality, Rancié, Occitanie, ranciéite occurs in cavities in limonite (Dana).
At the Filhols Mine, Romano, Italy, ranciéite occurs in lake-deposited tuff, associated with halloysite (Dana).
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