The most important mineral component of lapis is lazurite. A number of other minerals may be contained within the stone such as calcite, pyrite and sodalite. Ground lapis was the secret of the blue in ultramarine, the pigment which painters used to paint the sea and the sky until the nineteenth century.
Used by some as a protective stone, it is said to be grounding with a strong connection to the earth and spirits of nature.
Beautiful and useful too! Pendulums are used much the same way as applied kinesiology or muscle testing to help determine the answer to a question.