Difference between revisions of "Deltalumite"
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'''Al<sub>2</sub>O<sub>3</sub> Deltalumite''' (δ form of corundum, polymorph of [[sapphire]]) – tetragonal – Mohs ?? (likely quite hard) – [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Deltalumite] | '''Al<sub>2</sub>O<sub>3</sub> Deltalumite''' (δ form of corundum, polymorph of [[sapphire]]) – tetragonal – Mohs ?? (likely quite hard) – [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Deltalumite] | ||
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| + | Its structural formula can be written as (Al<sub>0.67</sub>◻<sub>0.33</sub>)Al<sub>2</sub>O<sub>4</sub>, where ◻ is a vacancy. | ||
== Related == | == Related == | ||
Revision as of 12:16, 30 August 2022
A polymorph of leukosapphire.
This compound/material/gemstone is interesting because normally Al2O3 forms leukosapphire (corundum structure).
Al2O3 Deltalumite (δ form of corundum, polymorph of sapphire) – tetragonal – Mohs ?? (likely quite hard) – [1]
Its structural formula can be written as (Al0.67◻0.33)Al2O4, where ◻ is a vacancy.
