Difference between revisions of "Silicon"

Revision as of 17:49, 9 December 2016

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Beside the commonly known quartz and amorphous glass there are many polymorphs of silicon dioxide (tectosilicates).

Quartz (Mohs 7 by definition | density 2.65 g/cm³)
α-quartz: trigonal -- β-quartz: hexagonal

Stishovite (Mohs 9-9.5 | density 4.287 g/cm³ | tetragonal - resembles rutile TiO₂)
Seifertite (Mohs ~9 | density 4.294 g/cm³ | orthorhombic - resembles scrutinyite α-PbO₂)

Coesite (Mohs 7.5 | density 2.92 g/cm³ (calculated) | monoclinic)
Cristobalite (Mohs 6-7 | density 2.32–2.36 g/cm³)
α-Cristobalite tetragonal
β-Cristobalite cubic - resembles diamond / ZnS

Tridymite (Mohs 7 | density 2.25–2.28 g/cm³) there are seven crystal phases of tridymite
two hexagonal: HP (β) & LHP -- three orthorhombic: OC (α) & OS & OP -- two monoclinic: MC & MX
Moganite (not MoRganite!) (Mohs 6 | 2.52-2.58 g/cm³ | monoclinic)

Revision as of 17:44, 9 December 2016 (view source) Apm (Talk \| contribs) (added all the basic polymorphs of silicon diaoxide)		Revision as of 17:49, 9 December 2016 (view source) Apm (Talk \| contribs) m Newer edit →
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	* [https://en.wikipedia.org/wiki/Tridymite Tridymite] (Mohs 7 \| density 2.25–2.28 g/cm<sup>3</sup>) there are seven crystal phases of tridymite <br> two hexagonal: HP (β) & LHP -- three orthorhombic: OC (α) & OS & OP -- two monoclinic: MC & MX		* [https://en.wikipedia.org/wiki/Tridymite Tridymite] (Mohs 7 \| density 2.25–2.28 g/cm<sup>3</sup>) there are seven crystal phases of tridymite <br> two hexagonal: HP (β) & LHP -- three orthorhombic: OC (α) & OS & OP -- two monoclinic: MC & MX
−	* [https://en.wikipedia.org/wiki/Moganite Moganite] (Mohs 6 \| 2.52-2.58 g/cm<sup>3</sup> \| monoclinic)	+	* [https://en.wikipedia.org/wiki/Moganite Moganite] (not Mo'''R'''ganite!) (Mohs 6 \| 2.52-2.58 g/cm<sup>3</sup> \| monoclinic)