You can find opals in a variety of shapes, colors, and sizes. An interesting fact about opal is, it’s a mineraloid and not a mineral. It is mainly formed of hydrated (wet) amorphous silica. On the Mohs Scale of hardness, opal clocks between 5.0 to 6.5. Opal is considered the traditional birthstone for the month of October, and considering the zodiac calendar, opal is best for all Librans out there (meaning, those born between 23 September and 22 October
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