Difference between revisions of "Hematite structure"
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| + | Also: Hematite group / Corundum group. | ||
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It's a slightly nontrivial hexagonal crystal structure. | It's a slightly nontrivial hexagonal crystal structure. | ||
== Highly abundant elements == | == Highly abundant elements == | ||
| − | * Al<sub>2</sub>O<sub>3</sub> [https://en.wikipedia.org/wiki/Aluminium_oxide Aluminium(III)_oxide] - [https://en.wikipedia.org/wiki/Sapphire leukosapphire] - (Sapphire and Ruby are colored variants) - 2,072°C - 3.987g/ccm - Mohs 9 (defining compound) | + | * '''Al<sub>2</sub>O<sub>3</sub>''' [https://en.wikipedia.org/wiki/Aluminium_oxide Aluminium(III)_oxide] - [https://en.wikipedia.org/wiki/Sapphire leukosapphire] - (Sapphire and Ruby are colored variants) - 2,072°C - 3.987g/ccm - Mohs 9 (defining compound) |
| − | * Ti<sub>2</sub>O<sub>3</sub> [https://en.wikipedia.org/wiki/Titanium(III)_oxide Titanium(III)_oxide] - [https://en.wikipedia.org/wiki/Tistarite tristarite] - 2,130°C (decomposes) - 4.49g/ccm - '''metallic luster - semiconducting to metallic at 200°C''' - Mohs 8.5 | + | * '''Ti<sub>2</sub>O<sub>3</sub>''' [https://en.wikipedia.org/wiki/Titanium(III)_oxide Titanium(III)_oxide] - [https://en.wikipedia.org/wiki/Tistarite tristarite] - 2,130°C (decomposes) - 4.49g/ccm - '''metallic luster - semiconducting to metallic at 200°C''' - Mohs 8.5 |
| − | * Fe<sub>2</sub>O<sub>3</sub> [https://en.wikipedia.org/wiki/Iron(III)_oxide iron(III)_oxide] [https://en.wikipedia.org/wiki/Hematite Hematite] - 5.3g/ccm - Mohs 5.5 to 6.5 | + | * '''Fe<sub>2</sub>O<sub>3</sub>''' [https://en.wikipedia.org/wiki/Iron(III)_oxide iron(III)_oxide] [https://en.wikipedia.org/wiki/Hematite Hematite] - 5.3g/ccm - Mohs 5.5 to 6.5 |
| + | * – Mn<sub>2</sub>O<sub>3</sub> only forms other different crystal structures with bigger unit cells (α-form, γ-form, ...) via [[thermodynamic means]] | ||
| + | ----- | ||
| + | * FeTiO<sub>3</sub> Ilmenite - 4.72g/ccm - Mohs 5.5 | ||
| + | * MgTiO<sub>3</sub> Geikielite - 4.4g/ccm - Mohs 5 | ||
| + | * MnTiO<sub>3</sub> Pyrophanite - 4.75g/ccm - Mohs 5 to 6 | ||
== More rare elements == | == More rare elements == | ||
| − | * Cr<sub>2</sub>O<sub>3</sub> [https://en.wikipedia.org/wiki/Eskolaite eskolaite] - 5.18g/ccm - Mohs 8 - metallic | + | * '''Cr<sub>2</sub>O<sub>3</sub>''' [https://en.wikipedia.org/wiki/Eskolaite eskolaite] - 5.18g/ccm - Mohs 8 - metallic |
* V<sub>2</sub>O<sub>3</sub> [http://www.webmineral.com/data/Karelianite.shtml karelianite (webmineral)] - Mohs 8 to 9 - metallic luster | * V<sub>2</sub>O<sub>3</sub> [http://www.webmineral.com/data/Karelianite.shtml karelianite (webmineral)] - Mohs 8 to 9 - metallic luster | ||
* Mn<sub>2</sub>O<sub>3</sub> [https://en.wikipedia.org/wiki/Bixbyite manganese-bixbyte] - 4.95g/ccm - Mohs 6 to 6.5 | * Mn<sub>2</sub>O<sub>3</sub> [https://en.wikipedia.org/wiki/Bixbyite manganese-bixbyte] - 4.95g/ccm - Mohs 6 to 6.5 | ||
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* Sb<sub>2</sub>O<sub>3</sub> [https://en.wikipedia.org/wiki/Valentinite valentinite] - 5.76g/ccm - Mohs 2.5 to 3 | * Sb<sub>2</sub>O<sub>3</sub> [https://en.wikipedia.org/wiki/Valentinite valentinite] - 5.76g/ccm - Mohs 2.5 to 3 | ||
| + | = Related = | ||
| + | |||
| + | * [[Gemstone like compound]] | ||
| + | * [[Simple crystal structures of especial interest]] | ||
| + | |||
= External links = | = External links = | ||
* Wikipediacategory: [https://en.wikipedia.org/wiki/Category:Hematite_group hematite group aka corundum group] | * Wikipediacategory: [https://en.wikipedia.org/wiki/Category:Hematite_group hematite group aka corundum group] | ||
| + | * Short paper about the discovery of tistarite: <br>"Tistarite, Ti2O3, a new refractory mineral from the Allende meteorite" [http://www.meteorman.org/Tistarite.pdf (pdf)] | ||
---- | ---- | ||
Corundum structure in 3D: | Corundum structure in 3D: | ||
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* at www.mindat.org [https://www.mindat.org/min-1136.html] | * at www.mindat.org [https://www.mindat.org/min-1136.html] | ||
* at www.mineralienatlas.de [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Corundum] | * at www.mineralienatlas.de [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Corundum] | ||
| − | * | + | * http://wwwchem.uwimona.edu.jm/courses/corundum.html – (good 3D view) |
* corundum group minerals [http://ruby.colorado.edu/~smyth/min/corundum.html] | * corundum group minerals [http://ruby.colorado.edu/~smyth/min/corundum.html] | ||
Latest revision as of 10:40, 28 June 2021
Also: Hematite group / Corundum group.
It's a slightly nontrivial hexagonal crystal structure.
Contents
Highly abundant elements
- Al2O3 Aluminium(III)_oxide - leukosapphire - (Sapphire and Ruby are colored variants) - 2,072°C - 3.987g/ccm - Mohs 9 (defining compound)
- Ti2O3 Titanium(III)_oxide - tristarite - 2,130°C (decomposes) - 4.49g/ccm - metallic luster - semiconducting to metallic at 200°C - Mohs 8.5
- Fe2O3 iron(III)_oxide Hematite - 5.3g/ccm - Mohs 5.5 to 6.5
- – Mn2O3 only forms other different crystal structures with bigger unit cells (α-form, γ-form, ...) via thermodynamic means
- FeTiO3 Ilmenite - 4.72g/ccm - Mohs 5.5
- MgTiO3 Geikielite - 4.4g/ccm - Mohs 5
- MnTiO3 Pyrophanite - 4.75g/ccm - Mohs 5 to 6
More rare elements
- Cr2O3 eskolaite - 5.18g/ccm - Mohs 8 - metallic
- V2O3 karelianite (webmineral) - Mohs 8 to 9 - metallic luster
- Mn2O3 manganese-bixbyte - 4.95g/ccm - Mohs 6 to 6.5
Way too rare elements
- Sb2O3 antimony_trioxide senarmontite
- Sc2O3 kangite
- Y2O3 Yttriaite-(Y)
- Bi2O3 bismite bismuth(III)_oxide -- not the monoclinic one
- Tl2O3 avicennite - 8.9g/ccm - Mohs 2
- Sb2O3 valentinite - 5.76g/ccm - Mohs 2.5 to 3
Related
External links
- Wikipediacategory: hematite group aka corundum group
- Short paper about the discovery of tistarite:
"Tistarite, Ti2O3, a new refractory mineral from the Allende meteorite" (pdf)
Corundum structure in 3D:
- at the materials project: [1]
- at www.mindat.org [2]
- at www.mineralienatlas.de [3]
- http://wwwchem.uwimona.edu.jm/courses/corundum.html – (good 3D view)
- corundum group minerals [4]
