Austinite from the Kitabira mine, Yamaguchi Prefecture, Japan

Abstract

Austinite occured from the Kitabira mine, Yamaguchi Prefecture, and this is the first occurrence from Japan. The unit cell parameters of austinite near the end member are a = 7.483(4), b = 9.039(6), c = 5.920(4) and V = 400.4(3). The chemical zoning in spherical aggregates is significant. They have values of Zn/(Zn+Cu) = 0.21-0.91 and As/(As+P) = 0.82-0.97. The chemical composition of austinite near the end member is (Ca_0.97Cd_0.01)_Σ0.98(Zn_0.86 Cu_0.11)_Σ0.97(As_0.97P_0.05)_Σ1.02O₄(OH).