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Hyalite opal from Tarcal (67 mm x 71 mm x 25 mm)
Hyalite, hyalite, (glass opal) opal variant on dacite-andesite bedrock. The mineral was surfaced in September 2020 during quarrying near Tarcal. The opal part of the stone measures approximately 67 mm x 71 mm x 25 mm. Weight approx: 84 grams + packaging. The special feature of the mineral is that it glows green in short-wave uw light.
