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File:Gray obsidian-knapped arrowhead (Oregon, USA).jpg

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English: Knapper: Perri Smith

Obsidian is a glassy-textured, extrusive igneous rock. It forms by either very rapid cooling of lava or by cooling of high-viscosity lava. The latter origin is the most common. Obsidian is usually black but can be other colors. Flow-banding may be present. Small, light-colored crystals may be commonly included in the glass - such rocks are called "vitrophyre". Sometimes, obsidian is encountered with whitish areas resembling snowflakes - "snowflake obsidian", which forms as the glass slowly devitrifies over geologic time.

The arrowhead seen here is a modern replica made from Oregon obsidian. The obsidian is mostly gray-colored and has flow-banding.
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Source https://www.flickr.com/photos/47445767@N05/51433191930/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/51433191930. It was reviewed on 7 September 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 September 2021

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current14:40, 7 September 2021Thumbnail for version as of 14:40, 7 September 20211,706 × 3,498 (3.37 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51433191930/ with UploadWizard

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