Base materials with high potential: Difference between revisions
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low density SiO<sub>2</sub> polymorphs |
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* [[leukosapphire]] - very hard | * [[leukosapphire]] - very hard | ||
* [[quartz]] | * [[quartz]] - and other low density polymorphs of SiO<sub>2</sub> | ||
== Con: Rather soft materials == | == Con: Rather soft materials == | ||
Revision as of 22:34, 12 April 2021
Best of the best
- diamond and its polymorphs including hexagonal diamond aka lonsdaleite
- moissanite - SiC - high heat resistance
- stishovite and seifertite - metastable ultrahard and dense SiO2 polymorphs
- simple titanium gemstones including: TiN TiP TiC TiSi2 TiB2 TiO2 Ti2O3
Simple rutile structure & hard
- rutile TiO2
- stishovite - metastable SiO2 polymorph - rutile structure & very hard and dense
- neo-polymorphs of the above
Simple salt structures
- periclase
- some transition metal monoxides
Con: low crystal structure symmetry
- leukosapphire - very hard
- quartz - and other low density polymorphs of SiO2
Con: Rather soft materials
- calcite and aragonite