Based on 'Rock glazes of NZ' Minna Bondy
Sample 88. Sand Near Motueka
Considerable Quartz and feldspars mainly potash, little grains of very fine argillite rocks. Sand probably derived from mixed granitic, sedimentary greywacke and argillite rocks.
Motueka Beach Sand
This is the first sample using beach sand, so far all other sands have come from river sources with a rock/mineral base from the surrounding geology. Beach sand varies in its composition due to the inclusion of calcium-based seashells and doesn't usually produce the best results unless it is high in silica. The bright golden sands of neighbouring Kaiteriteri are high silica and the surrounding rock is mostly granite, perhaps why Bondy chose to test it as a sample.