bn:00404582n
Noun Concept
EL
πετρώματα  υπερβασικά  υπερβασικά πετρώματα  υπερβασικών
EN
Ultramafic rocks are igneous and meta-igneous rocks with a very low silica content, generally >18% MgO, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals. Wikipedia
Relations
Sources