Iceland Spar $6.00

Iceland Spar, also known as Optical Calcite, is a clear variety of calcite prized for its strong birefringence, the property that splits light into two separate rays. Historically, it is believed Vikings may have used Iceland Spar to help navigate on cloudy days by detecting polarized light. Each specimen highlights the natural crystal structure of calcite, making it both a visually striking and scientifically interesting mineral.

Why You’ll Love This

• Demonstrates birefringence, showing how light can split into two images within the crystal
• Provides a tangible example of optical properties in minerals, useful for educational purposes
• Clear to translucent with naturally varying patterns and shapes, making each piece unique
• Compact size (approximately 1.5–2 x 1–1.5 x 1 inches) perfect for display or hands-on learning
• Connects geology and history, illustrating both natural processes and potential historical applications

A small but captivating mineral specimen that combines the beauty of crystallography with a story of science and exploration.