Stishovite - Revision history

Apm at 08:05, 23 September 2025

2025-09-23T08:05:48Z

← Older revision		Revision as of 10:05, 23 September 2025
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	Given both stishovite and rutile feature the same crystal structure it may be possible <br>		Given both stishovite and rutile feature the same crystal structure it may be possible <br>
	to mechanosynthesize checkerboard [[neo-polymorph]]ic transitions by replacing some Si with with Ti in a regular pattern. <br>		to mechanosynthesize checkerboard [[neo-polymorph]]ic transitions by replacing some Si with with Ti in a regular pattern. <br>
	Potentially improving eventual stability problems at low ambient pressures of only 1atm. <br>		Potentially improving eventual stability problems at low ambient pressures of only 1atm and slightly elevated temperatures. <br>

	Stishovite is a metastable compound (like diamond and lonsdaleite but even harder to reach by non mechanosynthetic means) <br>		Stishovite is a metastable compound (like diamond and lonsdaleite but even harder to reach by non mechanosynthetic means) <br>

Apm: linebreaks

2025-09-23T08:04:52Z

linebreaks

Apm at 08:03, 23 September 2025

2025-09-23T08:03:09Z

← Older revision		Revision as of 10:03, 23 September 2025
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	Just like like common quartz stishovite is a polymorph of silicon dioxide (SiO<sub>2</sub>). <br>		Just like like common quartz stishovite is a polymorph of silicon dioxide (SiO<sub>2</sub>). <br>
	It may be of peculiar for [[gemstone based atomically precise technology]] ~~interest~~ because of:		It may be of peculiar interest for [[gemstone based atomically precise technology]] because of:
	* its high hardness ('''Mohs 8.5 to 9.5''') compared to quartz (mohs 7 - defining mineral)		* its high hardness ('''Mohs 8.5 to 9.5''') compared to quartz (mohs 7 - defining mineral)
	* it consisting of the two globally (and often locally) most common elements in earth crust		* it consisting of the two globally (and often locally) most common elements in earth crust

Apm: gemstone based atomically precise technology

2025-09-23T08:01:59Z

gemstone based atomically precise technology

← Older revision		Revision as of 10:01, 23 September 2025
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	Just like like common quartz stishovite is a polymorph of silicon dioxide (SiO<sub>2</sub>). <br>		Just like like common quartz stishovite is a polymorph of silicon dioxide (SiO<sub>2</sub>). <br>
	It may be of peculiar interest because of:		It may be of peculiar for [[gemstone based atomically precise technology]] interest because of:
	* its high hardness ('''Mohs 8.5 to 9.5''') compared to quartz (mohs 7 - defining mineral)		* its high hardness ('''Mohs 8.5 to 9.5''') compared to quartz (mohs 7 - defining mineral)
	* it consisting of the two globally (and often locally) most common elements in earth crust		* it consisting of the two globally (and often locally) most common elements in earth crust

Apm: /* External links */

2025-09-23T07:59:01Z

External links

← Older revision		Revision as of 09:59, 23 September 2025
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	* https://en.wikipedia.org/wiki/Stishovite		* https://en.wikipedia.org/wiki/Stishovite
	* Structure of unit cell in 3D: [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Stishovite]		* Structure of unit cell in 3D: [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Stishovite]
			* Image of a stone with tiny specks of the mineral on it: <br>https://commons.wikimedia.org/wiki/File:Stishovite._N%C3%B6rdlinger_Ries,_Germany-8906.jpg
	[[Category:Base materials with high potential]]		[[Category:Base materials with high potential]]

Apm at 07:38, 23 September 2025

2025-09-23T07:38:38Z

← Older revision		Revision as of 09:38, 23 September 2025
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	~~Mohs 8.5-9.0 tetragonal~~

	Just like like common quartz stishovite is a polymorph of silicon dioxide (SiO<sub>2</sub>). <br>		Just like like common quartz stishovite is a polymorph of silicon dioxide (SiO<sub>2</sub>). <br>
	It may be of peculiar interest because of:		It may be of peculiar interest because of:
	* its high hardness (~~mohs~~ 8.5 to 9.5) compared to quartz (mohs 7 - defining mineral)		* its high hardness ('''Mohs 8.5 to 9.5''') compared to quartz (mohs 7 - defining mineral)
	* it consisting of the two globally (and often locally) most common elements in earth crust		* it consisting of the two globally (and often locally) most common elements in earth crust
	* it still featuring a reasonably simple (tetragonal) crystal structure with the [[rutile]] structure		* it still featuring a reasonably simple '''(tetragonal) crystal structure with the [[rutile]] structure'''

	Given both stishovite and rutile feature the same crystal structure it may be possible		Given both stishovite and rutile feature the same crystal structure it may be possible

Apm at 07:37, 23 September 2025

2025-09-23T07:37:46Z

← Older revision		Revision as of 09:37, 23 September 2025
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			Mohs 8.5-9.0 tetragonal

	Just like like common quartz stishovite is a polymorph of silicon dioxide (SiO<sub>2</sub>). <br>		Just like like common quartz stishovite is a polymorph of silicon dioxide (SiO<sub>2</sub>). <br>

Apm: /* Related */

2025-09-05T09:33:31Z

← Older revision		Revision as of 11:33, 5 September 2025
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	* [[Rutile]] – same crystal structure and unit cell as stisovite <br>Systematically substituting some of stishovites silicon atoms for titanium atoms gives [[neo-polymorph]]s. <br> See: [[Mechadensite]]		* [[Rutile]] – same crystal structure and unit cell as stisovite <br>Systematically substituting some of stishovites silicon atoms for titanium atoms gives [[neo-polymorph]]s. <br> See: [[Mechadensite]]
	* '''[[Base materials with high potential]]'''		* '''[[Base materials with high potential]]'''
			----
			* [[Quartz]] & [[Silicon]] & [[Oxygen]]

	== External links ==		== External links ==

Apm: /* Misc */ added note on unusual threefold coordination of the oxygen atoms

2025-04-07T12:20:42Z

Misc: added note on unusual threefold coordination of the oxygen atoms

← Older revision		Revision as of 14:20, 7 April 2025
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	Stishovite has a very high density for a SiO<sub>2</sub> polymorph ( 4.287 g/ccm ) this is because		Stishovite has a very high density for a SiO<sub>2</sub> polymorph ( 4.287 g/ccm ) this is because
	in stishovite the silicon is octahedrally coordinated and bound to eight oxygen atoms instead of just four removing a lot of the voids in the crystal structure.		in stishovite the silicon is octahedrally coordinated and bound to eight oxygen atoms instead of just four removing a lot of the voids in the crystal structure. The oxygen atoms are threefold coordinated to titanium (rather than twofold coordinated like in most cases as e.g. in quartz).

	A polymorph of SiO<sub>2</sub> with a similar density is [[seifertite]] ( 4.294 g/cm3 ).		A polymorph of SiO<sub>2</sub> with a similar density is [[seifertite]] ( 4.294 g/cm3 ).

Apm: /* Related / '''Base materials with high potential'''

2023-06-06T08:54:27Z

Related: * '''Base materials with high potential'''

← Older revision		Revision as of 10:54, 6 June 2023
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	* [[Rutile structure]]		* [[Rutile structure]]
	* [[Rutile]] – same crystal structure and unit cell as stisovite <br>Systematically substituting some of stishovites silicon atoms for titanium atoms gives [[neo-polymorph]]s. <br> See: [[Mechadensite]]		* [[Rutile]] – same crystal structure and unit cell as stisovite <br>Systematically substituting some of stishovites silicon atoms for titanium atoms gives [[neo-polymorph]]s. <br> See: [[Mechadensite]]
			* '''[[Base materials with high potential]]'''

	== External links ==		== External links ==

← Older revision		Revision as of 10:04, 23 September 2025
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	* it still featuring a reasonably simple '''(tetragonal) crystal structure with the [[rutile]] structure'''		* it still featuring a reasonably simple '''(tetragonal) crystal structure with the [[rutile]] structure'''

	Given both stishovite and rutile feature the same crystal structure it may be possible		Given both stishovite and rutile feature the same crystal structure it may be possible <br>
	to mechanosynthesize checkerboard [[neo-polymorph]]ic transitions by replacing some Si with with Ti in a regular pattern.		to mechanosynthesize checkerboard [[neo-polymorph]]ic transitions by replacing some Si with with Ti in a regular pattern. <br>
	Potentially improving eventual stability problems at low ambient pressures of only 1atm.		Potentially improving eventual stability problems at low ambient pressures of only 1atm. <br>

	Stishovite is a metastable compound (like diamond and lonsdaleite but even harder to reach by non mechanosynthetic means)		Stishovite is a metastable compound (like diamond and lonsdaleite but even harder to reach by non mechanosynthetic means) <br>
	A substitution of Si with Ti (if possible in greater quantities) may (or may not) increase the stability against conversion back into		A substitution of Si with Ti (if possible in greater quantities) may (or may not) increase the stability against conversion back into <br>
	more thermodynamically stable polymorphs such as quartz at higher temperatures.		more thermodynamically stable polymorphs such as quartz at higher temperatures. <br>

	== Misc ==		== Misc ==

	Stishovite has a very high density for a SiO<sub>2</sub> polymorph ( 4.287 g/ccm ) this is because		Stishovite has a very high density for a SiO<sub>2</sub> polymorph ( 4.287 g/ccm ) this is because <br>
	in stishovite the silicon is octahedrally coordinated and bound to eight oxygen atoms instead of just four removing a lot of the voids in the crystal structure. The oxygen atoms are threefold coordinated to titanium (rather than twofold coordinated like in most cases as e.g. in quartz).		in stishovite the silicon is octahedrally coordinated and bound to eight oxygen atoms instead of just four <br>
			removing a lot of the voids in the crystal structure. <br>
			The oxygen atoms are threefold coordinated to titanium <br>
			(rather than twofold coordinated like in most cases as e.g. in quartz). <br>

	A polymorph of SiO<sub>2</sub> with a similar density is [[seifertite]] ( 4.294 g/cm3 ).		A polymorph of SiO<sub>2</sub> with a similar density is [[seifertite]] ( 4.294 g/cm3 ). <br>
	It is orthorhombic with a unit cell that perhaps is slightly more complex than stishovites simple rutile structure.		It is orthorhombic with a unit cell that perhaps is slightly more complex than stishovites simple rutile structure. <br>

	== Related ==		== Related ==