a) Micrograph of a thin section of the sample PA 1 showing chlorite and K-mica crystals (sandwiches) in a calcite and quartz-rich matrix N+, 32x

b) Micrograph of a thin section of the sample PA 1 or mineral, quartz and calcite crystals N//, 16x

c) As a previous micrograph but N+

d) Micrograph of a thin section of the sample PA 1 showing a system of iso-parallel micro-fessures N//, 16x