Blue chalcedony is a type of microcrystalline quartz that is known for its pale blue or bluish-gray color. It is a relatively common mineral and is found in many locations around the world. Blue chalcedony crystals can occur in a variety of forms, including nodules, geodes, and botryoidal (globular) masses.

Blue chalcedony crystals have a waxy or pearly luster and are translucent to opaque. They are typically found in shades of pale blue, although they can also be found in shades of gray, white, and even brown. The color of blue chalcedony is caused by the presence of trace amounts of iron and other minerals.

In addition to its aesthetic value, blue chalcedony is also believed to have metaphysical properties. It is said to promote calmness and tranquility, and to help with communication, both with others and with the self. Blue chalcedony is also thought to have a soothing energy that can help with anxiety, stress, and depression.

Blue chalcedony is a relatively soft mineral, with a Mohs hardness of 6.5 to 7. It is often used in jewelry making, particularly in cabochon or bead form. Its subtle color and calming energy make it a popular choice for those seeking a gentle and soothing gemstone.