“Alluvial, colluvial or chemically formed gravel, clayey gravel, sandstone, limestone, tuff, scoria are examples of marginal materials.”

“In addition to scoria and ash, other volcanic ejecta include blocks, bombs, and xenoliths.”

“Small vesicular pieces of volcanic material, scoria, collect around the vent to form a cinder cone.”

“Various assays are described and directions given for crucible, scorification, and cupellation tests.”

“It hath also the property of rendering them volatile, and greatly facilitates their scorification.”

“The concentration of the button of lead may be effected either by scorification or by fusion in a crucible.”

“It has been found profitable to resmelt the scoriae of the ancient workings.”

“The first of these shows no sign of either lavas or scoriae, but volcanic rocks occur on the margins of the other two.”

“We have as yet no proof that Man witnessed the origin of these hills of lava and scoriae of the middle phase of volcanic action.”