Approximate groundmass mineral assemblage of these samples according to CIPW norm calculations were 25.5% quartz, 40.5% plagioclase, 23.0% orthoclase, 5.6% diopside, 1.7% hypersthene, 0.7% magnetite and 0.1% apatite for the rhyolite sample, 23.6% quartz, 46.5% plagioclase, 20.7% orthoclase, 5.6% diopside, 2.7% hypersthene, 0.9% magnetite and 0.1% apatite for the obsidian sample interior and 34.9% quartz, 46.4% plagioclase, 12.4% orthoclase, 1.5% hypersthene, 0.5% magnetite and 0.1% apatite for the dacite.
Meðal steindasamsetning í grunnmassa sýnanna samkvæmt CIPW-norm útreikningum reyndist vera 25.5% kvarts, 40.5% plagíóklas, 23.0% orthóklas, 5.6% díopsít, 1.7% hýpersín, 0.7% magnetít og 0.1% apatít fyrir líparít sýnið, 23.6% kvarts, 46.5% plagíóklas, 20.7% orthóklas, 5.6% díopsíð, 2.7% hýpersín, 0.9% magnetít og 0.1% apatít fyrir hrafntinnu sýnið og 34.9% kvarts, 46.4% plagíóklas, 12.4% orthóklas, 1.5% hýpersín, 0.5% magnetít og 0.1% apatít fyrir dasít sýnið.