Samples were taken from the glassy rims of pillow lava at Þórisvatn, Bolaalda, Kleifarvatn and from two mines at Sveifluháls.
Sýni voru tekin af glerrimum bólstrabergs við Þórisvatn, Bolaöldu, Kleifarvatn og tveimur námum við Sveifluháls.