Difference between revisions of "Salts of oxoacids"
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One of the harder ones is brochantite [http://en.wikipedia.org/wiki/Brochantite (wikipedia)] - (Mohs 3.5-4) | One of the harder ones is brochantite [http://en.wikipedia.org/wiki/Brochantite (wikipedia)] - (Mohs 3.5-4) | ||
| − | == | + | == Borate minerals == |
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| + | [http://en.wikipedia.org/wiki/Borate_minerals (wikipedia)] | ||
| + | * Mg<sub>3</sub>B<sub>7</sub>O<sub>13</sub>Cl Boracite [http://en.wikipedia.org/wiki/Boracite (wikipedia)] - (Mohs 7-7.5) | ||
| + | |||
| + | == Nitrate minerals == | ||
All rather water soluble. See: [http://en.wikipedia.org/wiki/Category:Nitrate_minerals (wikipedia - minerals)] | All rather water soluble. See: [http://en.wikipedia.org/wiki/Category:Nitrate_minerals (wikipedia - minerals)] | ||
[http://en.wikipedia.org/wiki/Template:Nitrates (wikipedia - artificial)] | [http://en.wikipedia.org/wiki/Template:Nitrates (wikipedia - artificial)] | ||
Revision as of 17:09, 9 April 2015
The X-O-X bonds present in those compounds increase the space between the spacially linking X atoms. This lead to a lower density of bonds in cross sections inclusion of bigger voids thus higher porousity. Due to the porousness of these compounds it is harder to get the surfaces flat - figuratively like the surface of a pumice stone. It's impossible to get them as smooth as passivated diamond. [todo: investigate wheter supralubricating bearings can be constructed from these types of diamondoid compounds]
Contents
Silicates (& Quartz)
Not exactly a salt but related ...
Phosphate minerals
- Especially interesting: Hydoxy- Fluor- & Clorappatite Ca5(PO4)3(F,Cl,OH) - (Mohs 5) - a biomineral
- Lazulite (wikipedia) & Scorzalite (wikipedia) magnesium iron aluminium phosphates - (Mohs 5.5-6)
- Phosphophyllite (wikipedia) - zinc iron phosphate - rather soft (Mohs 3.5)
- Pb5(PO4)3Cl pyromorphite (wikipedia) - relatively hard for a lead mineral (Mohs 3.5)
- YPO4 Xenotime (wikipedia) - rare yttrium - high symmetry (tetragonal) - (Mohs 4.5)
Carbonate minerals
(wikipedia - minerals) (wikipedia - artificial)
- Calcite & Aragonite - calcium
- Magnesite - magnesium
- Siderite - iron
- Smithsonite - zinc
- Malachite & Azurite - copper
- Rhodochrosite - manganese (rare)
- ...
Sulfate minerals
Sulfate minerals are generally rather soft with few exceptions.
One of the harder ones is brochantite (wikipedia) - (Mohs 3.5-4)
Borate minerals
- Mg3B7O13Cl Boracite (wikipedia) - (Mohs 7-7.5)
Nitrate minerals
All rather water soluble. See: (wikipedia - minerals) (wikipedia - artificial)
