The Mineral Diabolite
biotite mineral

Diaboleite is a blue-colored mineral . In 1986, synthetic diaboleite crystals of size up to 0.18 mm size were produced by using two singular processes. The study established that diaboleite was a low-temperature tolerant mineral that is stable in hydrothermal conditions with a temperature range that is under 100 - 170 °C.

Cumengeite has been recorded as the first mineral that forms at the higher temperatures. The International Mineralogical Association accorded this mineral legitimacy since it was listed before 1959.

Chemical Formula

Pb2CuCl2 (OH) 4

Derivation of Name

The diaboleite mineral was Discovered in the UK in 1923 and they named it Boliete and later as Diaboleite. This is a derivation of the Greek words διά and boleite, meaning "distinct from boleite".


Diaboleite is found in oxidized manganese ore, in the form of a secondary mineral as an extremely oxidized copper- lead- ore and on seawater-exposed slag. Nitric acid totally dissolves Diaboleite.


Boleite, another name for Diaboleite, was named after Boleo, Baja California. Their occurrence is prominent and restricted to the Mammoth-St. Anthony as well as in the Rowley Mines, Arizona, in the USA and in the typical regions of the Mendip Hills, Higher Pitts Mine, Somerset, in England.


Many interpret Diaboleite from Greek as the "different" boleite. One should not confuse it with pseudoboleite or the "false" boleite. All three minerals, Diaboleite, Beoleite and Pseudoboleite have similar chemistries and color, though boleite's is more complex, and includes silver (Pb26Cu24Ag10Cl62(OH) 48 - 3H2O). These three minerals and others having similar chemistries belong to a division in the Halides Class called the Oxyhalides and Hydroxyhalides. These minerals have oxygen and/or hydroxide groups in their respective formulae. The oxygen atom in the formula might require classification in the Oxides Class of minerals, but for the structures being more tied to the halide elements and oxygen and hydroxides are sort of extra to the general structure.


Color is sky blue to dark blue.


5.48 g/cm3

Mohs scale hardness


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