Basalt Rock Specimen with Fibrous Veins - Natural Geological Sample #167558 (License: Personal Use)

The specimen is a dense, fine-grained basalt formed from rapidly cooled lava, displaying prominent white fibrous textures likely from devitrification or secondary mineral growth (e.g., zeolites or cristobalite). Its surface combines matte, rugged zones with smooth, glossy black patches indicating vesicular or glassy flow features. The irregular shape and high contrast make it an excellent teaching aid for igneous petrology.

Used on educational geology websites, museum digital collections, rock identification guides, and online mineral shops; targets students, collectors, and educators seeking authentic volcanic rock examples.