“Combeite (large colorless with inclusions), aegirine (green, acicular), nepheline (colorless, rectangular), and sodalite (colorless modified cubes, below largest combeite). Sample collected by Hans Eugster. Plane polarized light: see accompanying photo with crossed polars.”

“Combeite (large crystals with sector twinning), aegirine (acicular), nepheline (white to grey, rectangular), and sodalite (extinguished in this photo). Sample collected by Hans Eugster. Crossed polars: see accompanying photo in plane polarized light.”

“Combeite (largest central crystal), nepheline (colorless, rectangular and hexagonal), aegirine (green, acicular) and sodalite (colorless modified cube, right of center)in peralkaline nephelinite lava. Sample collected by Hans Eugster. Plane polarized light.”

“Phenocrysts of wollastonite (cores of raspberries), combeite (rinds of raspberries, and 8-sided phenocrysts), nepheline (clear, colorless) and aegirine (green, acicular) in peralkaline nephelinite lava. A reaction relation between wollastonite and liquid to produce combeite has been captured. Plane polarized light.”

“Combeite (large octagonal phenocrysts, and raspberry), nepheline (colorless, rectangular and hexagonal), and aegirine (dark green) in peralkaline nephelinite. The brown glass is a chilled volatile-rich phonolite melt, immiscible with the main green melt.”

“Combeite (large sector-twinned crystals), nepheline (white to grey, rectangular and hexagonal), and aegirine (yellow and white, mostly acicular) in peralkaline nephelinite. Crossed polars; see accompanying photo in plane polarized light.”

“FOV=1.5 mm. Photo by Stephan Wolfsried; analysis by Guenter Blass (by EDS, oxides are: 5.5% Na, 12.8% K, 16.6% Al, 64.1% Si, 0.5% Fe, 0.5% Ti). Sample collected by Hans Eugster. This photo is of a vesicle lined with phillipsite crystals in a strongly peralkaline nephelinite lava, collected shortly after an explosive eruption in 1966. This sample formed part of a suite of specimens studied by T. Peterson (see the reference list for this locale). The yellow glass, which has a composition similar to phonolite, is interpreted as an immiscible segregation from the surrounding dark green, nephelinitic glass, which is rich in nepheline, combeite, and clinopyroxene. The yellow phonolitic melt was very volatile-rich and produced a gas vesicle upon cooling.”

“FOV=1 mm. Photo by Stephan Wolfsried; analysis by Guenter Blass (by EDS, oxides are: 5.5% Na, 12.8% K, 16.6% Al, 64.1% Si, 0.5% Fe, 0.5% Ti). Sample collected by Hans Eugster. This photo is of a vesicle lined with phillipsite crystals in a strongly peralkaline nephelinite lava, collected shortly after an explosive eruption in 1966. This sample formed part of a suite of specimens studied by T. Peterson (see the reference list for this locale). The yellow glass, which has a composition similar to phonolite, is interpreted as an immiscible segregation from nephelinitic glass, which is rich in nepheline, combeite, and clinopyroxene. The yellow phonolitic melt was very volatile-rich and produced a gas vesicle upon cooling.”