Rodingite
Metamorphic rock
Rodingite is a metasomatic rock composed of grossular-andradite garnet, calcic pyroxene, vesuvianite, epidote and scapolite. Rodingites are common where mafic rocks are in proximity to serpentinized ultramafic rocks. The mafic rocks are altered by high pH, Ca2+ and OH− fluids, which are a byproduct of the serpentinization process, and become rodingites. The mineral content of rodingites is highly variable, their high calcium, low silicon and environment of formation being their defining characteristic. Rodingites are common in ophiolites, serpentinite mélanges, ocean floor peridotites and eclogite massifs. Rodingite was first named from outcrops of the Dun Mountain Ophiolite Belt in the Roding River, Nelson, New Zealand.
An obsolete name for rodingite is granatite.
Sources and credits
This article is adapted from the Wikipedia article “Rodingite”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Rodingite from Maryland USA - Smithsonian Rock Sample 1.jpg by Andoni Alvarez, Smithsonian Institution, CC0
- Metasomatized dyke in serpentinite Nelson New Zealand.jpg by Dushan Jugum, CC BY-SA 4.0
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