Stones quarried from the Les Latneuses ‘hybrid’ layer are very beautiful, usually quite hard, and a dream to hone on. In this photo – I believe we are looking at a minute FeOx deposit near the edge of one of my Les Lats.
Objective – Neo Splan 5x
Relay lens – 3.3x
Illumination – Reflected Darkfield with Off-Axis Halogen Fiber-Optic