There are 3 key rock types, but strangely enough not all rocks neatly fall into these designations. Some break the existing set of purely sedimentary, igneous, or metamorphic rock designations. Today's video will explain this niche case and identifying features of the 3 main rock types. If you would like to support this channel, consider using one of the following links: (Patreon: http://patreon.com/geologyhub) (YouTube membership: https://www.youtube.com/channel/UCYeGh5VML5XPr5jYnzh3J6g/join) (Gemstone & Mineral Etsy store: http://prospectingarizona.etsy.com) (GeologyHub Merch Etsy store: http://geologyhub.etsy.com) Google Earth imagery used in this video: ©Google & Data Providers This video is protected under "fair use". If you see an image and/or video which is your own in this video, and/or think my discussion of a scientific paper (and/or discussion/mentioning of the data/information within a scientific paper) does not fall under the fair use doctrine, and wish for it to be censored or removed, contact me by email at [email protected] and I will make the necessary changes. Various licenses used in sections of this video (not the entire video, this video as a whole does not completely fall under one of these licenses) and/or in this video's thumbnail image (and this list does not include every license used in this video and/or thumbnail image): Public Domain: https://creativecommons.org/publicdomain/mark/1.0/ CC BY 2.0: https://creativecommons.org/licenses/by/2.0/legalcode CC BY-SA 3.0: https://creativecommons.org/licenses/by-sa/3.0/legalcode Sources/Citations: [1] U.S. Geological Survey [2] Wentworth, Chester Keeler. “A Scale of Grade and Class Terms for Clastic Sediments.” The Journal of Geology 30 (1922): 377 - 392. 0:00 The 3 Rock Types 0:29 Igneous Rocks 1:32 Sedimentary Rocks 1:58 Metamorphic Rocks 2:40 Metasedimentary & Metaigneous 2:59 Migmatite