Igneous Accretionary Lapilli Tuff ID'd

This is the igneous (volcanic) rock called accretionary lapilli tuff--using photogrammetry. Tuff forms from an explosive volcanic eruption, and/or pyroclastic flow (a hot landslide of a volcanic rock and dust mixture). Tuff is a hot volcanic ash and/or rocks that later forms into a solid mixture of its volcanic sand/ash and rocks. Volcanic tuff is different than pumice, because pumice contains abundant void spaces (vesicles) that can lower the whole rock density (often can be enough to make the rock float on water). Tuff may contain some vesicles, but not as much as pumice. Tuff is associated with felsic and intermediate volcanic rock compositions.
This rock is associated with the Ohanapecosh Formation (which has a greenish color). It is a fine-grained tuff that contains lapilli with fine-grain rims. This rock-face sample, shows many examples of these lapilli impressions (the rounded and oval structures on this rock are not fossils).
There is a cut and polished sample of this rock (in another video), to compare with this rock surface to the other. The link to this other video (with the cut and polished surface) is at the end of this video. The location is an abandoned roadcut quarry, just outside the southeast boundary of Mt. Rainier National Park. in Washington State (near the Ohanapecosh entry to the national park) [SE Sec. 20, T14N, R 10E].
Hello Rock People! This is Dave the Geology Dude. Note that I have other videos with more rock identification information on my CZcams channel. This video is meant as a quick view of rock samples without distractions (from on-screen text or voiceovers). It is best to see as many examples of the same rock type--because only then you understand the range of variables associated with each rock type. Also, be aware that the only way to really learn rock identification, is to have hands-on experience. Don't forget that: Geology isn't rocket science--it's Rock Science! Please "like" and subscribe to this CZcams channel!
Music (CZcams Audio Library): 69 Bronco (by DJ Williams). Thanks to Al Eggars for advice regarding this rock.
Copyright by David Knoblach, 2022. All rights reserved (please contact me for permission to use).

[@GeologyDude]

Hello Rock People! This is Dave the Geology Dude! There is more to this video than just a spinning rock. There are detailed notes in the description area for this video. If you want more, other videos on rocks are on my CZcams homepage. Check them out, or leave a comment here!

[@mafic_taco7061]

Green tuff is Cool stuff👍🏼. I really love that polished piece. Thanks Dave

[@GeologyDude]

Thx. It’s nice to see this rock in both perspectives!