CAL104 Fluorescent Calcite 33 This specimen features dark blue

This specimen features dark blue

Hardness of about 3 on the Mohs scale

Small Amethyst Plates from Uruguay

a quartz section

It features bright yellow banded and mossy agate

CAL104 Fluorescent Calcite 33 This specimen features dark blueThis calcite rhomb has naturally straight sides created from its distinct cleavage properties. The rhombohedral formation produces double refraction, which is why this material is also known as Optical Calcite. When you look at objects through the calcite, it splits the rays of light and displays two images of the same object. This piece is a gemmy, translucent peachy pink, which is a result of the presence of manganese within its chemical makeup.