Identifying Pegmatite

www.gvsuhsag.weebly.com

[@SweetSunrising]

Thank you! This was the clearest example on how to distinguish a general Pegmatite from granites. It’s one rock that can be very confusing for us rock novices especially when they’ll have the same minerals as granitic rock. I have one book that does call it a granite but with bigger crystals in it from slower cooling.

[@khaleesi4210]

This tells us what Pegmatite is but not how to identify it. Need more examples and images of different kinds and what about each of them actually makes them Pegmatite.

[@thirstfast1025]

Haha it drives me nuts when people find clear quartz with, say, blue colored host under it and exclaim "I found blue quartz!"

[@entztrix]

thanks for all these videos. What is that book are you using when you identify them?

[@gvsuhsag6989]

Laboratory Manual in Physical Geology (American Geological Institute National Association of Geoscience Teachers, Seventh Edition)

[@carlos2nice]

I thought pegmatitie is metamorphic rock

[@jamesreynolds5045]

Poor example of pegmatite: as pegmatite most often derives from cooling granite, or granitoid magmas, which themselves are mainly not two but three minerals, feldspar, quartz and mica, the example in this video lacking the usual mica constituent can be misleading to novice rock and mineral collectors...the sample here could just as well be from a feldspar-quartz vein, dyke or sill, but not pegmatite. I would have expected a much more competent presentation from GVSU HSAG.