Product Overview

2"-2.5" sample of optical calcite, also known as Iceland Spar
Optical calcite is birefringent, allowing it to split and transmit beams of light into double images
Calcite can be used in lessons on mineral hardness, cleavage, and effervescence
Samples vary naturally, and may not be identical to those pictured
Great addition to any collection, whether in a classroom or in the home

Looking through this specimen of calcite will have you seeing double. The unique crystal structure of calcite allows it to split and transmit a beam of light into two, displaying two of the same image - this is especially fun to do with a laser pointer.

Each specimen exhibits calcite's characteristic rhombohedral cleavage, making it a comprehensive tool for geology classrooms.

This sample of calcite is between 2 and 2.5 inches long, and weighs between 2 and 4 ounces.

Samples vary naturally, and may not look identical to those pictured.

If you reach out to us before you buy, we will send a picture to ensure you are receiving a specimen you'll like.