Okaite from Oka Carbonatite Complex, Early Cretaceous; Oka Niobium Mine, Quebec, Canada. Okaite is a feldspathoidal ultramafic igneous rock composed of nepheline, melilite, biotite mica, plus minor accessory minerals.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/47445767@N05">James St. John</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jsjgeology/14820243314/">Okaite (Oka Carbonatite Complex, Early Cretaceous; Oka Niobium Mine, Quebec, Canada)</a>