Blue calcite is a mineral that forms through the precipitation of calcium carbonate in the Earth's crust, typically in sedimentary and metamorphic rocks. As calcium-rich fluids flow through the rock, they can dissolve and redeposit calcium carbonate in the form of calcite. The blue color of blue calcite is due to the presence of trace amounts of copper, which replaces some of the calcium ions in the crystal lattice. The intensity of the blue color can vary depending on the amount of copper present.

Blue calcite is believed to have several metaphysical properties. It is often associated with the throat chakra, which is linked to communication and self-expression. Some of the metaphysical properties attributed to blue calcite include:

1. Communication: Blue calcite is believed to help with clear communication and self-expression, as well as enhance public speaking skills.

2. Relaxation: Blue calcite is said to have a calming and soothing energy, which can help with anxiety and stress relief.

3. Intuition: Blue calcite is believed to enhance intuition and psychic abilities, and help with spiritual development.

4. Healing: Blue calcite is said to help with physical and emotional healing, particularly in the areas of the throat, lungs, and respiratory system.

5. Creativity: Blue calcite is thought to stimulate creativity and artistic expression.