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A new organic mineral species, lazaraskeite, ideally Cu(C 2 H 3 O 3 ) 2  with two polytypes  M  1  and  M  2 , was discovered in the high elevation of the Santa Catalina Mountains, north of Tucson, Arizona, U. S.A. Both lazaraskeite- M  1  and  -M  2  occur as euhedral individual crystals (up to 0.20 × 0.20 × 0.80 mm) or aggregates, with the former being more equant crystals and the latter bladed crystals elongated along the  c  axis. Associated minerals include chrysocolla, malachite, wulfenite, mimetite, hydroxylpyromorphite, hematite, microcline, muscovite, and quartz. Both polytypes are greenish-blue in transmitted light, transparent with white streak, and a vitreous luster. They are brittle and have a Mohs hardness of ~2; cleavage is perfect on {101}. No parting or twinning was observed. The measured and calculated densities are 2.12(2) and 2.138 g/cm 3 , respectively, for lazaraskeite- M  1  and 2.10(2) and 2.086 g/cm 3  for lazaraskeite- M  2 . Optically, lazaraskeite- M  1  is biaxial (−), with α  =  1.595(3), β = 1.629(8), γ = 1.645(5), 2 V  meas  = 69(2)°, 2 V  cal  = 67°. Lazaraskeite- M  2  is also biaxial (−), with α  =  1.520(5), β = 1.578(6), γ = 1.610(5), 2 V  meas  = 73(2)°, 2 V  cal  = 70°. Lazaraskeite is insoluble in water or acetone. An electron microprobe analysis for Cu and an Elemental Combustion System equipped with mass spectrometry for C yielded an empirical formula, based on 6 O apfu, Cu 1.01 (C 1.99 H 2.99 O 3 ) 2  for lazaraskeite- M  1  and Cu 1.01 (C 1.98 H 3.00 O 3 ) 2  for lazaraskeite- M  2 . The measured δ 13 C ‰ values are –37.7(1) and –37.8(1) for lazaraskeite- M  1  and  -M  2 , respectively.

Lazaraskeite, Cu(C 2 H 3 O 3 ) 2 , the first organic mineral containing glycolate, from the Santa Catalina Mountains, Tucson, Arizona, U.S.A