5 Types of Awesome Glass Made by Nature

When it comes to sparkly objects, the planet Earth has a lot to offer. Here are 5 especially awesome glasses made by nature!

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Sources:
https://flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/index.html
https://www.britannica.com/science/obsidian
https://www.sciencedirect.com/science/article/pii/0022309375901209
http://volcano.oregonstate.edu/book/export/html/205
https://www.mindat.org/min-8520.html
https://www.sandatlas.org/volcanic-glass/

https://www.mindat.org/min-3004.html
https://pubs.geoscienceworld.org/msa/ammin/article-abstract/93/11-12/1865/44683/common-gem-opal-an-investigation-of-micro-to-nano?redirectedFrom=PDF
https://pubsapp.acs.org/cen/whatstuff/stuff/8104sci3.html
https://australianmuseum.net.au/learn/minerals/gemstones/opal/
https://www.mindat.org/min-32187.html
https://www.ga.gov.au/education/classroom-resources/minerals-energy/australian-mineral-facts/opal
https://cosmosmagazine.com/space/opal-found-in-antarctic-meteorite

https://australianmuseum.net.au/learn/minerals/shaping-earth/tektites/
https://www.britannica.com/science/tektite
http://www.jsg.utexas.edu/npl/outreach/tektites/
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19750015372.pdf

https://oumnh.ox.ac.uk/fulgurites
http://www.usfcam.usf.edu/cam/exhibitions/1998_12_McCollum/supplemental_didactics/47.Petrified.pdf
https://link.springer.com/article/10.1007%2Fs00410-012-0753-5
https://www.mindat.org/min-2363.html
https://blogs.discovermagazine.com/but-not-simpler/tag/fulgurite/

http://glassspongereefs.com/the-discovery/
https://oceanservice.noaa.gov/facts/glass-sponge.html
http://docs.niwa.co.nz/library/public/NBM-124.pdf
https://www.ncbi.nlm.nih.gov/pubmed/21680406
https://www.mpg.de/5595233/climate_archive_deep-sea_sponge
https://australianmuseum.net.au/learn/animals/sea-stars/sponges/invertebrates-collection-deepsea-glass-sponge/

Image Sources:
https://www.videoblocks.com/video/semiprecious-stones-euy9kmpolijrviv3d
https://commons.wikimedia.org/wiki/Category:Obsidian#/media/File:13_years_of_Russian_Wikinews_in_Moscow_21.jpg
https://commons.wikimedia.org/wiki/Category:Obsidian#/media/File:Glass_Mountain_in_northern_California_in_summer_2012_(15).JPG
https://commons.wikimedia.org/wiki/Category:Snowflake_obsidian#/media/File:Snowflake_Obsidian441.jpg
https://www.istockphoto.com/photo/lava-gm155375562-19741844
https://commons.wikimedia.org/wiki/File:Opal_Welo_-_Welo,_Afar_Province,_Etiopia,_Afryka..jpg
https://www.videoblocks.com/video/ripples-on-the-water-close-up-hrjvwkr
https://www.flickr.com/photos/jsjgeology/29885687305/in/photolist-oTFG2S-paUhve-pb8Fpf-2eMiXq1-8FpLeH-oWjT8z-pbNjqs-oTFujd-2eA7tuR-C9iBux-paU4Bi-p98HaA-24Wa8Qc-UpyxVY-MwTXCM-TqdxZi-MmYqAy-Mw1Dfs
https://commons.wikimedia.org/wiki/File:Indochinite.jpg
https://www.istockphoto.com/photo/lunar-crater-surface-texture-backdrop-gm957057906-261324105
https://www.istockphoto.com/vector/earth-from-space-with-moon-and-rocket-gm831703660-135365579
https://www.istockphoto.com/photo/watercolor-vintage-world-map-in-green-colors-gm1043715014-279376499
https://en.wikipedia.org/wiki/Moldavite#/media/File:Moldavite_No.2.jpg
https://en.wikipedia.org/wiki/Australite#/media/File:Australite_back_obl.jpg
https://en.wikipedia.org/wiki/Philippinite#/media/File:Philippinite.jpg
https://en.wikipedia.org/wiki/Fulgurite#/media/File:Fulgurite1.jpg
https://commons.wikimedia.org/wiki/File:Fulgurites-algeria.jpg
https://en.wikipedia.org/wiki/Fulgurite#/media/File:Fulgurite.JPG
https://commons.wikimedia.org/wiki/Category:Fulgurites#/media/File:Type_IV_rock_fulgurite_2.jpg
https://en.wikipedia.org/wiki/Fulgurite#/media/File:Fulgurite_at_Rice_NW_Museum_-_Hillsboro,_Oregon.JPG
https://commons.wikimedia.org/wiki/File:Type_II-III_fulgurite,_Ann_Arbor,_MI.jpg
https://en.wikipedia.org/wiki/Hexactinellid#/media/File:SpongeXenophorid.jpg
https://commons.wikimedia.org/wiki/File:Expl6627_(9734259269).jpg
https://commons.wikimedia.org/wiki/File:Expn4384_(27840605922).jpg
https://www.istockphoto.com/photo/computer-classroom-gm506889946-84447115

Видео 5 Types of Awesome Glass Made by Nature канала SciShow