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Mineral sequestration aims to trap carbon in the form of solid carbonate salts. This process occurs slowly in nature and is responsible for the deposition and accumulation of limestone (calcium carbonate) over geologic time. Carbonic acid in groundwater slowly reacts with complex silicates to dissolve calcium, magnesium, alkalis and silica and leave a residue of clay minerals. The dissolved calcium and magnesium react with bicarbonate to precipitate calcium and magnesium carbonates, a process that organisms use to make shells. When the organisms die, their shells are deposited as sediment and eventually turn into limestone. Limestones have accumulated over billions of years of geologic time and contain much of Earth's carbon. Ongoing research aims to speed up similar reactions involving alkali carbonates.
One proposed reaction is that of the olivine-rich rock dunite, or its hydrated equivalent serpentinite with carbon dioxide to form the carbonate mineral magnesite, plus silica and iron oxide (magnetite).
Serpentinite sequestration is favored because of the non-toxic and stable nature of magnesium carbonate. The ideal reactions involve the magnesium endmember components of the olivine (reaction 1) or serpentine (reaction 2), the latter derived from earlier olivine by hydration and silicification (reaction 3). The presence of iron in the olivine or serpentine reduces the efficiency of sequestration, since the iron components of these minerals break down to iron oxide and silica (reaction 4).
 Serpentinite reactions
Mg-Olivine + Carbon dioxide → Magnesite + Silica
Mg2SiO4 + 2CO2 → 2MgCO3 + SiO2 + H2O
Serpentine + carbon dioxide → Magnesite + silica + water
Mg3[Si2O5(OH)4] + 3CO2 → 3MgCO3 + 2SiO2 + 2H2O
Mg-Olivine + Water + Silica → Serpentine
3Mg2SiO4 + 2SiO2 + 4H2O → 2Mg3[Si2O5(OH)4
Fe-Olivine + Water → Magnetite + Silica + Hydrogen
3Fe2SiO4 + 2H2O → 2Fe3O4 + 3SiO2 + 2H2
Originally posted by TheRedneck
It is a bad idea to store CO2 underground, but not because it is deadly in itself. It would also be a bad idea to store helium, neon, nitrogen, or any gas underground in pressurized containers.
Originally posted by xman_in_blackx
Reply to post by Iamonlyhuman
I am amazed at the levels of stupidity filling ATS and society in general. Any gas at high concentrations will be deadly. This includes oxygen (yes, the stuff you need to breathe or you will die).Too much oxygen can kill you. Carbon dioxide, neon (or any inert gases), nitrogen (which the majority of our atmosphere consists of) will also be deadly at high concentrations. This is a stupid argument. Want to find a cause to believe in? Look into the real issue: pollution of our water supply.
As far as your statement that CO2 cannot, even in confined spaces, be toxic and deadly - please back up that statement with proof. I've provided mine on the effects of CO2 in confined spaces, please provide yours.