Cinnabar: Mercury Sulphide HgS
Some Geology subjects I found in my files sent back from my Agency as they no longer want 'Hard Copy' images only 'Digital'
I took them when i was a Scientific Photographer at University College , London. They were on show in display cabinets for the Geology Students. I used a British-made MMP Mk Viii 4x5 camera with 120 rollfilm back, AGFACOLOR CT18 film, lens was a 150mm f5.6 Symmar and lighting was Braun Hobby flash heads. I got my ABIPP and ARPS Qualifications in 1970 for Geology Photography.