andesite-basalt	plagioclase	1.13			Higuchi & Nagasawa 1969
basalt-andesite-dacite	olivine		0.74	0.78	Kennedy et al. 1993
basalt-andesite-rhyolite	olivine		0.77	0.91	Beattie 1994
chondrite chondrule	low calcium pyroxene		0.89	1.1	Kennedy et al. 1993
dacite	biotite	0.537			Higuchi & Nagasawa 1969
komatiite	garnet		1.07	1.14	Yurimoto & Ohtati 1992
rhyolite	plagioclase		0.87	0.94	Icenhower & London 1996
ultramafic	metal			0.1	Kilburn & Wood 1997