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Rock details

railway pit face
railway pit face
(Update 11/6/2014)

Quote from W.D.Birch "Geology of Victoria" Geological Society of Australia, 2003.  P.367.
"All rocks are nepheline hawiites with phenocrysts of olivine and clinopyroxene in a groundmass of plagioclase, olivine, clinopyroxene, opaques and glass."
"Blocks and bombs have abundant inclusions as small anorthoclase, olivine and clinopyroxene crystals, pyroxene megacrysts and lherzolite and granitic rock fragments."

Below are links to more details on the geology of scoria cones (or cinder cones)
 Formation of scoria cones:

 Formation of a cinder cone.             //
How volcanoes work

Description of olivine            //

google images of olivine            //

More details of olivine          //