| Classification |
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| Species: | Opal |
| Formula: | SiO2 · nH2O |
| Confirmation |
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| Validity: | Believed Valid |
| References |
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| References: | Hentschel, G.(1987): Die Mineralien der Eifelvulkane, Weise Verlag München, 2. Auflage |
| Data |
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| Mineral Data: | Click here to view Opal data |
| Locality Data: | Click here to view Goßberg, Walsdorf, Hillesheim, Vulkaneifel, Rhineland-Palatinate, Germany |
| Nearest other occurrences of Opal |
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| 1.6km (1.0 miles) | | ⓘKyller Höhe, Hillesheim, Vulkaneifel, Rhineland-Palatinate, Germany |
| 2.2km (1.3 miles) | | ⓘGraulay (Graulai; Graulei; Grauley), Hillesheim, Vulkaneifel, Rhineland-Palatinate, Germany |
| 4.0km (2.5 miles) | | ⓘFeuerberg, Hinterweiler, Daun, Vulkaneifel, Rhineland-Palatinate, Germany |
| 4.1km (2.6 miles) | | ⓘDöhmberg, Zilsdorf, Hillesheim, Vulkaneifel, Rhineland-Palatinate, Germany |
| 11.0km (6.8 miles) | | ⓘKahlenberg (Auf'm Kopp; Kallenberg), Oberstadtfeld, Daun, Vulkaneifel, Rhineland-Palatinate, Germany |
| 15.7km (9.8 miles) | | ⓘEmmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany |
| 38.7km (24.0 miles) | | ⓘCaspar quarry, Bellerberg volcano, Ettringen, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany |
| 40.3km (25.0 miles) | | ⓘRothenberg, Bell, Mayen-Koblenz, Rhineland-Palatinate, Germany |
| 41.8km (26.0 miles) | | ⓘThelenberg, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany |
| 42.7km (26.6 miles) | | ⓘPumice quarries, Wingertsberg, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany |