View source for Polymorphs of silicon dioxide

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== More commonly known SiO<sub>2</sub> gemstones ==

* Common [[Quartz]]
* amorphous forms (properties similar to: chalcedon, opal, obsidian, ...) <br>[[mechanosynthesis]] would allow for synthesis of '''pseudo amorphous configurations''' <br> [[Neo-polymorph]]s

== Especially interesting since unusually hard and dense ==

* [[Stishovite]] Mohs 8.5-9.0 tetragonal –– may be transitionable into other gemstomes with the same [[rutile structure]] forming [[pseudo phase diagram]]s
* [[Seifertite]] Mohs ~9 orthorhombic –– (scrutinyte structure)
Both are metastable very hard and very dense. <br>
They may not be very resilient against high temperatures.

== Other polymorphs of SiO<sub>2</sub> ==

* {{wikitodo|add some more known ones}}
* https://en.wikipedia.org/wiki/Category:Silica_polymorphs
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'''Basic low density polymprphs:'''
* https://en.wikipedia.org/wiki/Keatite Mohs 5.75 tetragonal 
* https://en.wikipedia.org/wiki/Tridymite  Mohs 7 orthorhombic (high temp modification)
* https://en.wikipedia.org/wiki/Cristobalite Mohs 6-7 tetragonal <br>(& high temp β-cristobalite cubic - diamond like structure)
* https://en.wikipedia.org/wiki/Melanophlogite Mohs 6.5-7.0 cubic or tetragonal
* https://en.wikipedia.org/wiki/Coesite Mohs 7.7-8.0 monoclinic
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'''Exotic stuff:'''
* https://en.wikipedia.org/wiki/Chibaite Mohs 7 cubic structure chalrate: <br>
* https://en.wikipedia.org/wiki/2D_silica

== Related ==

* [[Silicon]], [[Oxygen]]
* [[Gemstone like compound]]
* [[Neo-polymorphs]]