Table 6 compares the mineralogical compositions of the examples of
Haruku rhyolitic temper displayed in the comparative sand-sherd set (Table
2) and in the archaeological Ambon sherds (Table 5). Grain types are
indistinguishable throughout, but relative portions of quartz, plagioclse
feldspar, and K-feldspar (as reported) are approximate, for routine distinction
is difficult during grain counting. Means and ranges in frequency percentage
for all grain types are statistically indistinguishable between the two sets of
populations tabulated. The variations in mineralogical composition are viewed
as inherent to the Haruku rhyolitic temper suite, and appear to offer no
effective means to distinguish between local tempers derived from different
parts of the geologically similar Arnbon-Haruku-Saparua chain of volcanic
islands using petrographic techniques.