Scalpel
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A scalpel or bistoury is a small and extremely sharp bladed instrument used for surgery, anatomical dissection, podiatry and various handicrafts. A lancet is a double-edged scalpel.
A lancet belonging to Edward Jenner
Reusable scalpel handles
X-Acto knife
Graduated handle
Obsidian
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Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Produced from felsic lava, obsidian is rich
Scalpel
…Scalpel blades are usually made of hardened and tempered steel, stainless steel, or high carbon steel; in addition, titanium, ceramic, diamond and even obsidian knives are not uncommon. For example, when performing surgery under MRI guidance, steel blades are unusable (the blades would be drawn to the magnets…
Lipari Obsidienne
Polished snowflake obsidian, formed through the inclusion of cristobalite crystals
Glass Mountain, a large obsidian flow at Medicine Lake Volcano in California
Jumble of pumice and volcanic obsidian, Obsidian Dome, California