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| Slovakia - Hlinik Hronom, coniferous, Miocene, diameter 4,5 cm |
Slovakia - Povraznik, opalized coniferous wood, cross section, Miocene,
8 cm |
Slovakia - Povraznik, opalized coniferous wood, longitudinal section, Miocene, 8 cm |
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| Slovakia - Povraznik, opalized coniferous wood, longitudinal section, Miocene, 11 cm |
Slovakia - Povraznik, opalized coniferous wood with knot, longitudinal section (both sides of the specimen), Miocene, 21,5 cm |
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| Slovakia - Povraznik, opalized wood of coniferous, longitudinal section with knot (both sides of the specimen), Miocene, 17 cm |
Slovakia - Povraznik, opalized wood of coniferous, cross section, Miocene, 13 cm |
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| Slovakia - Velky Dur, coniferous, opalized wood, Miocene, longitudinal section, 8 cm |
Slovakia - Velky Dur, coniferous, opalized wood, Miocene, diameter 7 cm |
Slovakia - Velky Dur, coniferous, opalized wood, Miocene, diameter 4 cm |
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Slovakia - Slančik,
quartz mineralisation,
9 x 5 cm, height 4,5 cm |
Slovakia - Slaska,
opalized wood,
8 x 6 cm |
Slovakia, opalized deciduous wood,
10 x 7 cm |
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Slovakia - Punicka Huta, Tertiary,
opalized deciduous wood, 8 x 5,5 cm |
Slovakia - Slančik, Tertiary,
25,5 x 12 cm |
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