Difference between revisions of "Olivine"
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[[File:Pallasite_slice-of-Esquel-meteorite.jpg|400px|thumb|right|A type of stony-iron meterorite called "pallasite". The green parts are olivine. This is believed to be a material that can be found in large quantities at the core mantle boundary of larger rocky planets.]] | [[File:Pallasite_slice-of-Esquel-meteorite.jpg|400px|thumb|right|A type of stony-iron meterorite called "pallasite". The green parts are olivine. This is believed to be a material that can be found in large quantities at the core mantle boundary of larger rocky planets.]] | ||
| − | ''' | + | '''Basic properties:''' |
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* Mohs 6.5 to 7.0 | * Mohs 6.5 to 7.0 | ||
* Orthorhombic – (Nesosilicate like [[topaz]]) | * Orthorhombic – (Nesosilicate like [[topaz]]) | ||
* (Nontrivial base cell?) | * (Nontrivial base cell?) | ||
| − | Suitability as | + | '''Two end members:''' |
| + | * iron-olivine: Fe<sub>2</sub>SiO<sub>4</sub> | ||
| + | * magnesium-olivine: Mg<sub>2</sub>SiO<sub>4</sub> | ||
| + | ---- | ||
| + | * [https://en.wikipedia.org/wiki/Fayalite Fayalite] Fe<sub>2</sub>SiO<sub>4</sub> (Mohs 6.5-7) <br> High pressure crystal structure γ-Fe<sub>2</sub>SiO<sub>4</sub> is called '''Ahrensite''' – [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Ahrensit] – (nice cubic unit cell – Mohs 6 – 4.26g/ccm) | ||
| + | * [https://en.wikipedia.org/wiki/Forsterite Forsterite] Mg<sub>2</sub>SiO<sub>4</sub> (Mohs 7) <br> Mid pressure crystal structure is called: [https://en.wikipedia.org/wiki/Wadsleyite Wadsleyite] – (orthrombic – Mohs ? – 3.84g/ccm)<br> High pressure crystal structure is called: [https://en.wikipedia.org/wiki/Ringwoodite '''Ringwoodite'''] – (nice cubic unit cell – Mohs ? – 3.9g/ccm) | ||
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| + | Suitability of these compounds as [[gemstone-like compound|base materials]] for [[gemstone metamaterial technology]] seems quite good. | ||
== Some Trivia == | == Some Trivia == | ||
Latest revision as of 16:59, 13 June 2021
Basic properties:
- Mohs 6.5 to 7.0
- Orthorhombic – (Nesosilicate like topaz)
- (Nontrivial base cell?)
Two end members:
- iron-olivine: Fe2SiO4
- magnesium-olivine: Mg2SiO4
- Fayalite Fe2SiO4 (Mohs 6.5-7)
High pressure crystal structure γ-Fe2SiO4 is called Ahrensite – [1] – (nice cubic unit cell – Mohs 6 – 4.26g/ccm) - Forsterite Mg2SiO4 (Mohs 7)
Mid pressure crystal structure is called: Wadsleyite – (orthrombic – Mohs ? – 3.84g/ccm)
High pressure crystal structure is called: Ringwoodite – (nice cubic unit cell – Mohs ? – 3.9g/ccm)
Suitability of these compounds as base materials for gemstone metamaterial technology seems quite good.
Some Trivia
Olivine is an extremely common mineral.
It is believed that there are large quantities of this stuff down at the core mantle boundary of Earth and above.
We know that from stony–iron meteorites called "pallasites" (very pretty to look at).
The asteroid psyche is believed to be the biggest arteroid in the asteroid belt that is mainly made out of pallasite.
Artificially mechanosynthesized ultra pure and flawless olivine would likely be colorless not green.
External links
- Wikipedia: Olivine
- Wikipedia: Pallasite
- on www.mineralienatlas.de
- https://en.wikipedia.org/wiki/16_Psyche
- https://en.wikipedia.org/wiki/Psyche_(spacecraft)
- https://www.nasa.gov/psyche
