The Opal Gemstone Quality
Read More- A-Z Guide of Cabochon Gemstones
1. The primary sources of opal are Australia and Ethiopia.
2. Opal is a hydrated amorphous form of silica.
3. It ranges from 5 to 6.5 on the Mohs scale.
4. A fire opal is a transparent to translucent opal with warm body colors of yellow to orange to red.
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