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Quartz-filled geode, shown from inside (top) and outside (bottom) A geode (/ ˈ dʒ iː. oʊ d /; 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
A geode is a simple term for a rock with a hollow in it, often with crystal formation/growth. A thunderegg on the other hand is a specific geological structure . A thunderegg may be referred to as a geode if it has a hollow in it, but not all geodes are thundereggs because there are many different ways for a hollow to form.
Nephelinite – Igneous rock made up almost entirely of nepheline and clinopyroxene – A silica-undersaturated plutonic rock with >90% nepheline; Norite – Mafic intrusive igneous rock – A hypersthene-bearing gabbro; Obsidian – Naturally occurring volcanic glass; Pegmatite – Igneous rock with very large interlocked crystals
Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however.
There is uncertainty on how to translate the proper name Omarolluk (and omar rocks). According to the records of the Canada Centre for Mapping and Earth Observation Natural Resources, the features Omarolluk Sound and Omarolluk Formation were named after Omarolluk, an Inuk man who accompanied and guided R. J. Flaherty on numerous geological surveys of the Belcher Islands and elsewhere in the ...
However, most of the spheres were created from gabbro, an acid-resistant igneous rock. [21] In the cosmogony of the Bribri, which is shared by the Cabecares and other American ancestral groups, the stone spheres are "Tara's cannon balls". Tara or Tlatchque, the god of thunder, used a giant blowpipe to shoot the balls at the Serkes, gods of ...
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