Geode – מילון אנגלי-אנגלי
geode
n.
hollow rock with a crystal-lined interior
Geode
Geodes (
Greek γεώδης - ge-ōdēs, "earthlike") are
geological secondary structures which occur in certain
sedimentary and
volcanic rocks. They are themselves of sedimentary origin formed by chemical precipitation. Geodes are essentially hollow, vaguely spheroid to oblate masses of mineral matter that form via either of two processes:
- by the filling of vesicles (gas bubbles) in volcanic to sub-volcanic rocks by minerals deposited from hydrothermal fluids or
- by the dissolution of sedimentary nodules or concretions (that were deposited syngenetically within the rock formations in which they are found) and partial filling by the same or other minerals precipitated from diagenetic water, groundwater or hydrothermal fluids.
geode
Noun
1. (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals
(hypernym) nodule
(classification) mineralogy
Geode (die)
nf.
geode, hollow rock with a crystal-lined interior
géode
nf.
geode, hollow rock with a crystal-lined interior