This text investigates the fundamental identification and classification of geological specimens found within the Earth's crust. Rudolf Borner provides a systematic framework for distinguishing between various minerals, rocks, and gemstones based on their physical and chemical properties. The work serves as a technical manual for field identification and laboratory analysis, utilizing established geological nomenclature to categorize specimens by their formation processes and structural characteristics.

Experts recognize this work as a reliable reference for students and amateur geologists requiring a structured approach to specimen identification. Readers frequently note the technical clarity of the descriptions, which prioritize functional utility over narrative prose.