View source for Ternary and higher gem-like compounds

Look out for rock forming minerals here

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Alkali and earth alkali compounds tend to be rather soluble in binary compounds (you won't find many [[S-block metals|there]]) in ternary and higher compounds they tend to form less water soluble minerals. See: '''[[s-block metals|compounds with s-block metals]]'''

* Ca(OH)<sub>2</sub> [http://en.wikipedia.org/wiki/Calcium_hydroxide calcium hydroxide aka slaked lime] (rather water soluble) 
* CaCO<sub>3</sub> [http://en.wikipedia.org/wiki/Caco3 calcium carbonate] (very slightly soluble) 
* MgCO<sub>3</sub> [https://en.wikipedia.org/wiki/MgCO3 magnesium carbonate aka magnesite] (slightly soluble)
* Mg<sub>3</sub>B<sub>7</sub>O<sub>13</sub>Cl [http://en.wikipedia.org/wiki/Boracite boracite] (very slightly water soluble)
* ... many more

== most common metal rich core mantle transition zone minerals ==

In the earths mantle and crust silicon and oxygen are the most abundant elements.
On the borther to earths outer core this changes to iron and nickle.
Down there the most abundant minearls are made from mixture of those elements: [http://en.wikipedia.org/wiki/Olivine olivine/peridot]
Of interest as diamondoid materials may be the pure end members of the mixing series:
* [http://en.wikipedia.org/wiki/Fayalite Fayalite] Fe<sub>2</sub>SiO<sub>4</sub>
* [http://en.wikipedia.org/wiki/Forsterite Forsterite] Mg<sub>2</sub>SiO<sub>4</sub>
* [http://en.wikipedia.org/wiki/Tephroite Tephroite] Mn<sub>2</sub>SiO<sub>4</sub> (less interesting since Mn is more scarce)
* [http://www.americanelements.com/titanium-silicate-nanopowder.html Titanium Silicate] TiSiO<sub>4</sub>
* [http://en.wikipedia.org/wiki/Titanite Titanite or Sphene] CaTiSiO<sub>5</sub> (optical dispersion exceeding diamond; birefringent)

In nature when iron rich metal is available in stochiometric excess heterogenous [http://en.wikipedia.org/wiki/Pallasite pallasite] is formed. This rock looks really beautiful and can be found in some meteroids.

Another interesting tertiary material would be CSiO<sub> 4</sub> <br>
a solid intermediate material between CO<sub>2</sub>(gas) SiO<sub>2</sub>(solid quartz): [http://www.ncbi.nlm.nih.gov/pubmed/24781844]

== The spinell group ([http://en.wikipedia.org/wiki/Spinel_group wikipedia]) ==

These oxide minerals are devoid of the ubiquitously present silicon.

'''aluminum spinells'''

* MgAl<sub>2</sub>O<sub>4</sub> - wikipedia: [http://de.wikipedia.org/wiki/Spinell spinell] 
* FeAl<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Hercynite hercynite]
* (Mg,Fe)Al<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Ceylonite caylonite] - mixing series inbetween the former two
* ZnAl<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Gahnite gahnite]
* BeAl<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Chrysoberyl crysoberyll]
* MnAl<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Galaxite galaxite] - (with rather rare manganese) - [http://rruff.info/Spinel/R070013 image]

'''iron spinells'''

* MgFe<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Magnesioferrite magnesioferrite]
* TiFe<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Ulv%C3%B6spinel ulvöspinel]  
* ZnFe<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Franklinite franklinite]
* NiFe<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Trevorite trevorite]
* MnFe<sub>2</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Jacobsite jacobsite] - (with rather rare manganese)
related compound:
* ZnFe<sub>3</sub>O<sub>4</sub> - wikipedia: [http://en.wikipedia.org/wiki/Zinc_ferrite zinc ferrite] - synthetic zinc ferrites