Opal is a form of amorphous silica. This means it forms with no true crystal structure. Opal can naturally contain up to 20% water. Opal is not a mineral, but a mineraloid because of its lack of structure. On a microscopic scale, opal contains spheres of silica, giving rise to the flashes of color we all know and love. The matrix associated with opal can be almost any visible color, most commonly white, occasionally black.
Opal is used in helping boost optimism, enthusiasm, and creativity. It is often used in stimulating intuition and insight. Opal picks up thoughts, feelings, and desires and amplifies them.
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