File:Synthetic star sapphire.jpg

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Original file (1,818 × 1,109 pixels, file size: 1.03 MB, MIME type: image/jpeg)

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Description
English: (15 millimeters across at its widest)

This polished cabochon ("cab") is a synthetic blue sapphire. Sapphire is aluminum oxide (Al2O3). In nature, this chemical is given the mineral name "corundum". Gem-quality corundum of any color except red is called "sapphire". When red, it is called "ruby". Corundum has a nonmetallic luster, can be any color, has a white streak, and a hardness of 9 on the Mohs Hardness Scale. It forms hexagonal crystals with flat ends and has no cleavage. Natural sapphire and ruby gemstones can have a hexaradiate "star" effect - it is best seen in very bright light. The center of the star moves around as the gem is tilted in the light. The star effect is called "asterism" or "triple chatoyancy" or "stellate opalescence", caused by scattering of light by microscopic rutile crystals. Rutile is TiO2 - titanium dioxide.

See info. at: en.wikipedia.org/wiki/Sapphire#Star_sapphire and

en.wikipedia.org/wiki/Sapphire#Synthetic_sapphire
Date
Source https://www.flickr.com/photos/47445767@N05/51485328835/
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@N05/51485328835. It was reviewed on 12 October 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

12 October 2021

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current18:03, 12 October 2021Thumbnail for version as of 18:03, 12 October 20211,818 × 1,109 (1.03 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51485328835/ with UploadWizard

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