Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
Gadolinite is a mineral characteristic of rare-earth rich granite pegmatites or alpine veins. No data have been published on the identification and efforts to locate any example, verified or not have been fruitless. The mineral may have been found in erratic pegmatite boulders, but certainly not in the marble.