Some larger #schorl #tourmaline crystals I managed to find inside some #luxullianite. Tourmaline is recognisable by it's long prismatic 'habit', the crystals also have a tendency to change colour along their length. Big ones are valuable as gemstones and apparently they might have been used as navigational aids for #Vikings (used to detect the sun's position pre-dawn or in cloudy conditions).

Some larger #schorl #tourmaline crystals I managed to find inside some #luxullianite. Tourmaline is recognisable by it's long prismatic 'habit', the crystals also have a tendency to change colour along their length. Big ones are valuable as gemstones and apparently they might have been used as navigational aids for Vikings (used to detect the sun's position pre-dawn or in cloudy conditions).

This is called #luxullianite - a rare rock (globally if not locally), shiny pink orthoclase crystals embedded in dark tourmaline called schorl. Part of the massive granite backbone that forms #Cornwall. Orthoclase is not limited to earth, as it has also been found on Mars. Strictly speaking, not technically #fossicking as this sample came from Mousehole beach.