Mexican Cantera "Jelly" opal is a precious opal that lies within a rhyolitic matrix. These fiery little nodules are absolute stunners!! They remind me of a miniature galaxy all within a stone. Each piece is beautifully unique and full of colorful surprises just waiting to be discovered. Precious opal is always a crowd-pleaser and you can't go wrong with these old-stock winners. Each piece is guaranteed to have color play.