#argilit

• Argillite — A compact argillaceous sedimentary rock, structurally formed through the diagenesis and deep cementation of clay muds, characterized by a higher hardness than simple clay and by the absence of fissility or the ability to split into thin sheets (unlike clay shales). In a geological sense, argillite represents an intermediate stage of metamorphism between soft pelitic sedimentary rocks and crystalline clay shales.
• Argillolite — A consolidated argillaceous sedimentary rock, structurally formed through the cementation, compaction, and deep dehydration of fine pelitic deposits (clay muds); a fine argillaceous sandstone or mudstone rock. In a geological sense, argilolitul is characterized by a massive texture, compact mass, and the absence of obvious fissility, representing a stable lithostratigraphic unit used in sedimentary basin analysis.