Cadwaladerite

cadwaladerite

tondiite

menyailovite

pauflerite

Images

Formula: Al2(H2O)(OH)4.n(Cl,OH-,H2O)
Chloride
Crystal System: Isometric
Specific gravity: 1.66 measured
Colour: Yellow
Solubility: Weakly hygroscopic.
Environments


Hot spring deposits

Localities

At the Maria Mine, Caleta Vítor mining district, Arica Province, Arica y Parinacota, Chile, minerals related to cadwaladerite also found at this location are tondiite, atacamite, paratacamite and anhydrite (CM 57.827-841).
Cadwaladerite from the Maria Mine - Image

The type Locality, Cerros Pintados, Tamarugal Province, Tarapacá, Chile, is an inactive epithermal hot spring deposit fed by SO4-rich waters; it is also the type locality for pickeringite and tamarugite. Samples collected in 2015 were associated with halite, anhydrite and jarosite.
The type sample of cadwaladerite from Cerros Pintados is lemon-yellow and transparent to translucent, occurring within masses of colourless granular and columnar halite crystals (CM 57.827-841).

Gewerkschaft Deutschland Mine, Oelsnitz, Erzgebirgskreis, Saxony, Germany, Marcel mine heap, Radlin, Wodzisław County, Silesian Voivodeship, Poland and Kladno mine, Libušin, Kladno District, Central Bohemian Region, Czech Republic. Cadwaladerite (previously called lesukite) has also been identified from burning coal seams in Germany, Poland and the Czech Republic (CM 57.827-841).
Cadwaladerite from the Gewerkschaft Deutschland Mine - Image

At the Khaidarkan Sb-Hg deposit, Kadamjay District, Batken Region, Kyrgyzstan, cadwaladerite has been found (CM 57.827-841).

At the Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia, mineral grains are found as accumulations in hot (50–300oC) ash and lava within zones of metasomatic transformation. Cadwaladerite (previously lesukite) is associated with meniaylovite, chlorartinite, pauflerite, sofiite and halite (CM 57.827-841).
Cadwaladerite from Tolbachic - Image

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