Formula: Pb4ZnZn2(PO4)4(OH)2
Phosphate, dongchuanite group
Crystal System: Triclinic
Specific gravity: 6.06 calculated
Hardness: 2 to 2½
Streak: Colourless
Colour: Turquoise–greenish blue; pale blue to light blue in transmitted light
Luminescence: No fluorescence under UV
Solubility: Easily dissolves in dilute hydrochloric acid

Sedimentary environments
Hydrothermal environments

Dongchuanite is a new mineral, approved in 2021 and to date (August 2023) reported only from the type locality.


At the type locality, Sanguozhuang, Dongchuan District, Kunming, Yunnan, China, it is generally believed that the ore deposit was formed by sedimentation–hydrothermal transformation. There is a wide variety of mineral species in the deposits, with more than 20 species of polymetallic sulphide minerals and more than 30 supergene minerals identified so far.
Dongchuanite was found in an abandoned mine shaft, occurring on a sandstone fracture around copper-sulphide ore veins, that are clearly of supergene origin. The dongchuanite may have been formed by the weathering of copper, lead and zinc sulphides under the action of surface water. Associated minerals are quartz, theisite, veszelyite, kipushite, tangdanite, tyrolite, arsenoveszelyite, bayldonite, cuprodongchuanite and hemimorphite.
Dongchuanite is composed of spherical aggregates of microscopic lamellar crystals. The size of the spherical aggregates ranges from 0.5 to 1 mm, and the thickness of single lamellar crystals ranges from 5 to 20 μm (MM 87, 611–618).

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