Group: Arsenates

Chemical composition: CaZnAsO4(OH)

Colors: Colourless, white to pale yellowish-white or bright green, colourless in transmitted ligh

Hardness: 4-4.5

Formation: Well developed orthorhombic crystals of bladed or acicular habit

Principal Sources: Utah, USA

Special Notes: A rare secondary mineral in the oxidized zone of some arsenic-rich base-metal deposits. Related in composition to conichalcite Named in honour of Professor Austin Flint Rogers.