Six elements from group VIII of the periodic table: iridium, osmium, palladium, platinum, rhodium, ruthenium.
Source: GeoRef Thesaurus 11th edition, 2000
Geological keywords, such as “granite”, “lake”. The definitions are generally taken from the AGI Glossary of Geology. Keywords with a geographic context (e.g. Cape Smith Fold Belt, Selwyn Basin, Grenville Province) are assigned to a separate category.
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