Deltalumite: Difference between revisions

Latest revision as of 19:42, 27 November 2025

This article is a stub. It needs to be expanded.

A polymorph of leukosapphire. Oxospinel type structure.
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 (Al_0.67◻_0.33)Al₂O₄, where ◻ is a vacancy.

How to spell this? Deltalumite? Delt-alumite? Delta-lumite? Delta-alumite?
Too much candy to pick from.

(wiki-TODO: Links seem to be broken, paper abstracts removed?!)

"Deltalumite, a new natural modification of alumina with spinel-type structure"

Researchgate Jannuary 2019 [2]
Researchgate December 2020 [3]
(semanticscholar) << Images!
Paper including figures showing projections of the structure
https://link.springer.com/article/10.1134/S1075701520070089

@@ Line 19: / Line 19: @@
 * [[Gemstone]]
 * '''[[Base materials with high potential]]'''
+----
+* [[Tistarite]] … a titanium oxide with sapphire stoichometry and structure (unusual)
 == External links ==