Frequently Asked Questions

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greenSand semi-hardening | 2-6


Olivine is the most common mineral and more than 20 times present to record all the carbon dioxide.

Olivine is located on the subsurface anywhere on earth. It is a mantle rock that has come up in the formation of most mountain ranges and volcanic eruptions.

Mg2 SiO4 + 4CO2 + 4H2O => 2Mg2 + + SiO2 + 4HCO3-

Olivine (alkali) reacts with CO2 (acid) and water

The reaction is unilateral and the CO2 is therefore finally converted.

1 kg greenSand certified olivine stores 1 kg of CO2

It is a natural weathering of a mineral. The reaction proceeds slowly, about 1-10 μm per year.

The reaction can be speed up by reducing the surface, further affecting: the presence of water, temperature, pressure, pH value and CO2.

greenSand is the mineral Olivine (Mg, Fe) 2SiO4 in stone of sand. Read more lees verder

Deacidification results in the withdrawal of CO2 from water. In addition, magnesium ions, bicarbonate and silica are released. These residues have a positive contribution to the environment on land and in water. Resulting in, greenSand gradually filling in the shortages of magnesium. The released magnesium is a main nutrient for plants.

You can sprinkle 500 grams per m2 for sufficient nutrition. All greenSand products give a positive contribution to combating Climate Change!



With greenSand CO2 Opruim Certificaten you compensate your CO2 emissions.

For pets, greenSand olivine is the same as sand and stones.

greenSand reacts with CO2 and water and then defines to bicarbonate (= lime) magnesium and sand. The lime solutions counteract acidification of the soil. The acidity degree rises and is stabilized. In addition, it gradually fills the shortages of magnesium. The released magnesium is a main nutrient for plants. 1 kg of greenSand olivine is similar as 1.43 kg of lime.

greenSand pot and garden soil are rich in magnesium. Magnesium is a main nutrient for plants and essential for the formation of chlorophyll (green of a leaf). GreenSand pot soil has more fertilizers and cares for an airy, loose root structure.

Advantage of sand spreading over salt is that it does not affect plants, animals or metals. greenSand are broken grains of olivine which makes it drier than river sand. greenSand does not melt snow or ice, but immediately provides a smoother surface. And the added value: greenSand cleans up CO2.

LCA (Life Cycle Analysis) is a method of determining the total mill load of a product throughout the life cycle, ie recovery of the required raw materials, production, transportation, use and waste management. A comprehensive LCA (Live Cycle Analysis) study has shown that the yield is 92%. See the simplified LCA here.

The production of certified olivine actually costs energy and emits CO2 emissions, but the Life Cycle Analysis research shows that the yield is 92%-96%.


Sequestering CO2 with olivine. The enhanced weathering process: olivine (alkaline) reacts with the CO2 (basic) and water and falls apart into sand, magnesium, bicarbonate and iron. Lead more. Lees verder

At high temperature and high pressure. For this an olivijn reactor is being developed.

These substances are not in Olivine. The mineral olivine is a silicate with the chemical formula: (Mg, Fe) 2SiO4. It is rich in magnesium and iron.