Unusual specimen of Mexican Opal with Rutile inclusionsIt is a mystery on how this Opal wasformed th
Unusual specimen of Mexican Opal with Rutile inclusionsIt is a mystery on how this Opal wasformed this way. Opal is silica and Mexican Opal is volcanic so to have rutilatedneedles form inside the silica or Opal it needed to have cavities. -- source link
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