Hydroxylhalide, perovskite group
Specific gravity: 5.41 to 5.43
Solubility: Completely soluble in nitric acid
Diaboleite belongs to the 4mm crystal class, which has only 6 members, including diaboleite, to date (June 2020).
At Minela Compania, Sierra Gorda, Antofagasta Province, Antofagasta, Chile, diaboleite has been found with paratacamite (AESS).
At the type locality, Higher Pitts Mine, Priddy, Mendip, Somerset, England, UK, diaboleite occurs in oxidised manganese ore associated with chloroxiphite, hydrocerussite, mendipite and cerussite (HOM, Mindat). It occurs both as a primary mineral, and in secondary form as an alteration product of chloroxiphite. As a primary mineral, diaboleite is generally found as small crystalline grains and masses but occasionally as relatively well formed minute crystals. Most commonly, diaboleite occurs as granular to crystalline blue masses within mendipite, often associated with paralaurionite. Crystals of diaboleite enclosed within cerussite and calcite have also been found, and therefore it must have formed relatively early in the paragenetic sequence. Small crystals of diaboleite have been found within masses of rickturnerite fibres. Diaboleite also occurs as a secondary phase accompanying altered chloroxiphite, where it is typically found as a powdery material surrounding the chloroxiphite. One such specimen studied also contained cotunnite in association with the diaboleite (JRS 13.33).
At the Gallagher Vanadium Property, Cochise county, Arizona, USA, diaboleite is only tentatively identified at present and is observed tiny blue crystals associated with anglesite, leadhillite and linarite from the dumps (R&M 90.4.343).
At the Mammoth Mine, Pinal County, Arizona, USA, At Tiger, Arizona, USA, diaboleite occurs as a secondary mineral in deeply oxidised lead-copper ores, associated with boleite, wherryite, hydrocerussite, leadhillite, phosgenite, caledonite, atacamite, paratacamite and cerussite (HOM). Diaboleite is widely distributed in the Collins vein in the 400 and 500 foot levels, associated with linarite. It is, in general, a late mineral, often found in drusy cavities in quartz. Common associates include cerussite and wulfenite, and more rarely dioptase. Implanted on diaboleite are crystals of boleite, pseudoboleite and quartz. In one specimen diaboleite is cut by a tiny vein of hemimorphite, and spherules of needles of this mineral are implanted upon it. Intergrowths of diaboleite and phosgenite were noted (AM 26.605-612).
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