What is a pegmatoid in geology ?

Pegmatoid : definition

A pegmatoid (or pegmatitoid) is a pegmatite without quartz, with orthoclase and nepheline, related to the massifs of nepheline syenites or to the ultrabasic massifs. In the first case, the pegmatoids are rich in feldspars, aegirine, and rare-earth complex minerals (eudialyte, aeschynite, etc...), in the second case, in apatite, phlogopite and magnetite.

More generally, this term designates the coarse-grained differentiation facies of basaltic rocks. It represents, as in the case of granitic pegmatites, the product of final differentiation of basic magmas.

ReCaptcha

This service is used to secure web forms of our website and required if you want to contact us. By accepting it you agree to Google's privacy policy: https://policies.google.com/privacy

Google Analytics

Google Analytics is a service used on our website that tracks, reports traffic and measures how users interact with our website content in order for us to improve it and provide better services.

Facebook

Our website allows you to like or share its content on Facebook social network. By activating and using it you agree to Facebook's privacy policy: https://www.facebook.com/policy/cookies/

YouTube

Integrated videos provided by YouTube are used on our website. By accepting to watch them you agree to Google's privacy policy: https://policies.google.com/privacy

Twitter

Integrated tweets and share services of Twitter are used on our website. By accepting and using these you agree to Twitter's privacy policy: https://help.twitter.com/en/rules-and-policies/twitter-cookies

PInterest

Our website allows you to share its content on PInterest social network. By activating and using it you agree to PInterest's privacy policy: https://policy.pinterest.com/en/privacy-policy/