Geode
Query URLs
https://term.museum-digital.de/md-de/tag/6523
- Note
- A geode (/ˈdʒiː.oʊd/; from Ancient Greek γεώδης (geṓdēs) ´earthlike´) is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded. The crystals are formed by the filling of vesicles in volcanic and subvolcanic rocks by minerals deposited from hydrothermal fluids; or by the dissolution of syn-genetic concretions and partial filling by the same or other minerals precipitated from water, groundwater, or hydrothermal fluids.
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Quarzdruse
Quarz ist nach den Feldspäten...
Object information
Image: Harzmuseum Wernigerode - CC BY-NC-SA -
Melaphyrmandel mit Chalcedon
Mandelsteine sind...
Object information
Image: Harzmuseum Wernigerode - CC BY-NC-SA -
Eisenhydroxid (Limonit)
In den jurassischen...
Object information
Image: Naturkunde-Museum Bielefeld (namu) - CC BY-NC-SA -
Markasit-Knolle
Markasit-Knolle...
Object information
Image: Naturkunde-Museum Bielefeld (namu) - CC BY-NC-SA -
Ausstellungsplakat Sonderausstellung "Einheimische Minerale"
Weißes Papier im...
Object information
Image: Museum Wolmirstedt - RR-F
References
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