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Chenevixite

• 
  Patagonia District, Patagonia Mts, Santa Cruz Co., Arizona, USA
  © Brent Thorne

• Formula:
  Cu₂Fe³⁺₂(AsO₄)₂(OH)₄

• System: Monoclinic

• Name:
  Named after Richard Chenevix (1774-1830), French chemist, analyst of an arsenate of copper and iron from Cornwall in 1801 (later shown to be Chenevixite).

• IMA Status: Valid (Grandfathered)

• Type Locality:
  Wheal Gorland, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK

• Dana 8th: 42.7.10.1
  
  42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
  7 : (AB)₂(XO₄)Z_q·xH₂O

• Hardness (Mohs): 3½ - 4½

• Density: 4.38 g/cm³ (measured)
  4.40 g/cm³ (calculated)

• Diapheny: Transparent,Translucent

• Diapheny: brittle

• Colour: Olive green, yellow-green, dark green.

• Streak: Greenish yellow