Eisco – Raw Biotite Gneiss Rock Sample Approx 2.75" – Coarse-Grained Foliated Metamorphic Rock – Geologic Teaching Specimen for Earth Science Labs, Mineral Identification, Classroom Collections

• METAMORPHIC ROCK SPECIMEN || One raw Biotite Gneiss specimen, approx. 2.75"; Demonstrates mineral segregation from metamorphic pressure and heat
• TEXTURAL & VISUAL FEATURES || Displays alternating light and dark mineral bands, including biotite, feldspar, and quartz, highlighting mineral segregation and gneissic structure
• EDUCATIONAL BENEFITS || Ideal for visualizing metamorphic processes, rock cycle transitions, foliation patterns, and mineral identification in academic, lab, or field settings
• INSTRUCTIONAL & DISPLAY USES || Suitable for classroom demonstrations, geology kits, mineral collections, and curriculum-aligned teaching of rock formation and classification
• NATURAL HAND SAMPLE || Raw, unpolished hand sample with natural texture and irregular form, selected to reflect authentic metamorphic features and suitable for instructional use

This raw Biotite Gneiss hand sample is a coarse-grained metamorphic rock with visible mineral banding and foliation, ideal for teaching geologic processes. Approximately 2.75", and commonly used in earth science classrooms, labs, and field kits, it demonstrates mineral segregation, recrystallization, and structural alignment. Suitable for rock cycle instruction, texture analysis, and comparative rock studies. Unpolished and representative of natural metamorphic formation.