The veinlet, VV, shows a very fine grained structure due to metasomatic replacement of country rock by the irregular veins of calcite. Photographer: Unknown
Scope & Content:
Genre: Scientific Photography Photomicrograph, circular image, mounted facing p. 158.
Microsection of Syenitic Rock showing the occurrence of metallic sulphides as original constituents of igneous rocks. Black grains consist of PbS and FeS. Photographer: Unknown
Scope & Content:
Genre: Scientific Photography Photomicrograph, circular image, mounted facing p. 162.