Tachylite is an unusual and relatively rare stone used in making flaked stone tools, and which is found in Aboriginal archaeological sites in Victoria, Australia. The material is rarely found and apparently is sourced from only one known location at Spring Hill near Lauriston, Victoria. There is another historical reference to a source at Green Hill near Trentham, Victoria, but the exact location has not been confirmed. Daniel James Mahony described ...water worn pebbles of pitchstone, a highly silicious volcanic glass associated with tachylite on the Coliban River. Mitchell refers to the distribution of the material with: Small artefacts are common at Willaura, Burrumbeet, Inverleigh, Point Cook and as far north as Dooen near Horsham.