White sapphire: Difference between revisions

Latest revision as of 08:32, 23 September 2025

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

Terminology

"White sapphire" (meaning clear transparent colorless) because we want to focus on perfect crystals without any color giving impurities.
A base material for gemstone metamaterial technology would be perfectly impurity free and colorless clear.

Just "sapphire" usually refers to sapphires with impurities (iron and titanium ions replace aluminum ions) causing a blue to black color.
Also called lecosapphire or leukosapphire (may be more prevalent in German).

Advantages of this gem

very hard material (Mohs 9 – defining mineral), very high heat conductivity
made out of the extremely common element aluminum (more common than carbon in diamond or moissanite)
Possibly helpful on the Moon with carbon being scarce.
like moissanite sapphire is thermodynamically stable not just metastable like diamond thus very heat resistant
Crystal structure: trigonal – Not as high symmetry as cubic but still good.

Maybe look at metastable Al₂O₃ polymorphs at the eventual cost of somewhat less heat resistance?

Isostructural gems (Hematite structure)

Tistarite Ti₂O₃
Hematite Fe₂O₃

See: Simple crystal structures of especial interest

Deltalumite – a tetragonal polymorph of Al2O3 with spinel structure
Tistarite Ti₂O₃ has the same structure. => neo-polymorph series?
Gemstone like compounds with high potential – Gemstone like compounds
Corundum structure – Simple crystal structures of especial interest
Aluminum oxides
Moissanite is also an extremely heat resistant base material.
Diamond is much less heat and oxidation resistant.
Both diamond and moissanite have higher crystal structure symmetry than leukosapphire

Base materials with high potential

Polymorphs

Deltalumite Al₂O₃ (δ form of corundum, polymorph of sapphire) – tetragonal – Mohs ? –

Trivia

🟥 Ruby is just red sapphire. Color from Chromium Cr.
🟦 Classic blue is from elements (Fe,Ti)
⬜️ transparent, no impurities, white sapphire
🟨 There are many other possible colors from impurities/dopants.

🟢 Emerald is NOT a form of sapphire but a green form of Beryl.
a beryllium aluminum silicate harder than typical silicates.
Beryllium is a quite rare element so forms of beryl are not that viable as a structural material.

External links

Wikipedia

materialsproject.org [1]
mineralienatlas (de) [2]
Strukturtypendatenbank uni-freiburg: [3]
Wikidata leukosapphire: https://www.wikidata.org/wiki/Q3831236

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-{{stub}}
+{{stub}} __NOTOC__
-Advantages:
+== Terminology ==
-* very hard material, very high heat conductivity
-* made out of the extremely common element aluminum (more common than carbon)
-* thermodynamically stable not just metastable thus very heat resistant
-Disadvantage: <br>
+"[[White sapphire]]" (meaning clear transparent colorless) because we want to focus on perfect crystals without any color giving impurities. <br>
-Crystal structure of less high symmetry than other interesting base materials. <br>
+A base material for [[gemstone metamaterial technology]] would be perfectly impurity free and colorless clear. <br>
-Maybe look at metastable polymorphs at the eventual cost of somewhat less heat resistance?
-Note: The page uses leukosapphire instead of just sapphire because <br>
+Just "sapphire" usually refers to sapphires with impurities (iron and titanium ions replace aluminum ions) causing a blue to black color. <br>
-just sapphire is often associated with a blue to black variant where the colour is caused by metal impurities. <br>
+Also called '''lecosapphire or leukosapphire''' (may be more prevalent in German).
-A base material for [[gemstone metamaterial technology]] would be perfectly impurity free and colorless clear though. <br>
-Like a leukosapphire just better.
+== Advantages of this gem ==
+* very hard material ('''Mohs 9''' – defining mineral), very high heat conductivity
+* made out of the '''extremely common element''' aluminum (more common than carbon in [[diamond]] or [[moissanite]]) <br><small>Possibly helpful on the [[Moon]] with carbon being scarce.</small>
+* like [[moissanite]] sapphire is '''thermodynamically stable''' not just metastable like [[diamond]] thus '''very heat resistant'''
+*  Crystal structure: '''trigonal''' – Not as high symmetry as cubic but still '''good'''.
+Maybe look at metastable Al<sub>2</sub>O<sub>3</sub> polymorphs at the eventual cost of somewhat less heat resistance?
+== Isostructural gems ([[Hematite structure]]) ==
+* [[Tistarite]] Ti<sub>2</sub>O<sub>3</sub>
+* [[Hematite]] Fe<sub>2</sub>O<sub>3</sub>
+See: [[Simple crystal structures of especial interest]]
 == Related ==
+* '''[[Deltalumite]]''' – a tetragonal polymorph of Al2O3 with spinel structure
+* '''Tistarite Ti<sub>2</sub>O<sub>3</sub> has the same structure.''' => [[neo-polymorph]] series?
+* '''[[Gemstone like compounds with high potential]]''' – [[Gemstone like compounds]]
+* [[Corundum structure]] – [[Simple crystal structures of especial interest]]
+* [[Aluminum oxides]]
 * [[Moissanite]] is also an extremely heat resistant base material.
 * [[Diamond]] is much less heat and oxidation resistant.
 * Both [[diamond]] and [[moissanite]] have higher crystal structure symmetry than leukosapphire
+----
+* '''[[Base materials with high potential]]'''
 [[Category:Base materials with high potential]]
+[[Category:Gemstones with color based names]]
+== Polymorphs ==
+'''[[Deltalumite]]''' Al<sub>2</sub>O<sub>3</sub> (δ form of corundum, polymorph of [[sapphire]]) – tetragonal – Mohs ? –
+== Trivia ==
+* 🟥 '''Ruby is just red sapphire.''' Color from Chromium Cr.
+* 🟦 Classic blue is from elements (Fe,Ti)
+* ⬜️ transparent, no impurities, white sapphire
+* 🟨 There are many other possible colors from impurities/dopants.
+----
+* 🟢 '''Emerald is NOT a form of sapphire but a green form of [[Beryl]].''' <br>a beryllium aluminum silicate harder than typical silicates. <br> [[Beryllium]] is a quite rare element so forms of beryl are not that viable as a structural material.
+== External links ==
+Wikipedia
+* [https://en.wikipedia.org/wiki/Corundum Corundum]
+* [https://en.wikipedia.org/wiki/Sapphire Sapphire]
+* [https://en.wikipedia.org/wiki/Ruby Ruby]
+----
+* materialsproject.org [https://materialsproject.org/materials/mp-1143/]
+* mineralienatlas (de) [https://www.mineralatlas.eu/lexikon/index.php/MineralData?mineral=Corundum]
+* Strukturtypendatenbank uni-freiburg: [http://ruby.chemie.uni-freiburg.de/Vorlesung/Strukturtypen/a2b3_korund.html]
+* Wikidata leukosapphire: https://www.wikidata.org/wiki/Q3831236