amorphous materials  search
RTmaterials
 clay minerals
 Andisols
 Andosols
 crystallinity
 glass materials
 glasses
 imogolite
 opal-A
 order-disorder
 shirasu
 shungite
 volcanic ash
 weathering
SNGeneral term for all materials not crystalline. Descriptive, not geologic term. Before 1978, also search amorphous AND materials.