home.social

#schorl — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #schorl, aggregated by home.social.

fetched live
  1. #Schorl (a kind of #Tourmaline) embedded in a nice piece of elvan - the #Cornish name for a particular type of hard granite with these large isolated tourmaline crystals.

    #Fossicked from #MineWaste at the top of the large tailings dam at the eastern end of the Wheal Maid valley. This was constructed from waste rock excavated from Mount Wellington, a mine a few miles away during the late 70s. This specimen is more likely to originate there than any of the many older mines nearby.

    mindat.org Specimen ID: 08U-EGH
    Field of View: 20 mm
    Largest Crystal Size: 7 mm

  2. CW: fossicking in Cornwall

    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).