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A new mineral species, segerstromite, ideally Ca 3 (As 5+ O 4 ) 2 [As 3+ (OH) 3 ] 2 , has been discovered at the Cobriza mine in the Sacramento district in the Copiapó Province, Chile. Crystals of segerstromite occur as tetrahedra, dodecahedra (up to 0.50 × 0.50 × 0.50 mm), or in blocky aggregates. Associated minerals include talmessite, vladimirite, and Sr-bearing hydroxylapatite. Similar to the associated minerals, segerstromite is a secondary mineral. The new mineral is colorless in transmitted light, transparent with a white streak and vitreous luster. It is brittle and has a Mohs hardness of ~4.5. No cleavage, parting, or twinning was observed. The measured and calculated densities are 3.44(3) and 3.46 g/cm 3 , respectively. Optically, segerstromite is isotropic, with  n  = 1.731(5). It is insoluble in water or hydrochloric acid. An electron microprobe analysis yielded an empirical formula (based on 14 O apfu) Ca 2.98 (AsO 4 ) 2.00 [As(OH) 3 ] 2.00 .

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Segerstromite, Ca 3 (As 5+ O 4 ) 2 [As 3+ (OH) 3 ] 2 , the first mineral containing As 3+ (OH) 3 , the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile