Obsidian Specimen, Obsidian Specimen, also known as volcanic glass, forms from lava that cools almost immediately upon eruption., Pack of 12

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Here is the corrected text: Obsidian, also known as volcanic glass, forms when lava cools almost immediately upon eruption, usually into water. This set of twelve obsidian samples is excellent for group study and examination in geology classrooms, where it can be used to demonstrate classification exercises. Obsidian shares many physical properties with its major chemical component, quartz, despite their dissimilar appearance. Each specimen is individually packaged in a transparent bag, labeled, and barcoded for easy identification. Selected and hand-processed by an actual geologist, each sample exhibits defining features. Our rock and mineral samples are sourced from various locations around the world and are processed by hand in Victor, NY. Each specimen will vary slightly in shape, size, and color but measures approximately 1 inch in length. If you have any questions or need additional information about our rock and mineral samples, feel free to reach out to our team of scientists and geologists for technical support.