Iyoite

Iyoite is a very rare manganese copper chloride hydroxide mineral with the formula MnCuCl(OH)₃. Iyoite is a new member of the atacamite group, and it an analogue of botallackite characterized in manganese and copper ordering. Iyoite is monoclinic (space group P2₁/m). It is chemically similar to misakiite. Both minerals come from the Ohku mine in the Ehime prefecture, Japan.^[3][4]

Iyoite
General
Category	Halide minerals
Formula	MnCuCl(OH)3
IMA symbol	Iy[1]
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	P21/m
Unit cell	a = 5.622, b = 6.586 c = 5.719 [Å]; β = 91.55°; Z = 2
Identification
References	[2]