Hyalite or water opal is a neutral coloured amorphous silica glass containing about 3-8 percent water. It forms in botryoidal (grape bunch) masses and other unusual shapes. This unassuming stoneÕs magnificence is best viewed in the dark under black light because it glows a bright green!In terms of healing mineral properties it is said to be an excellent stone for attracting ones needs, such as resources, wealth or companionship.