natural capital for a richer life

FAQ

Click on one of the questions below and the answer will appear. You can of course send your own question to us at faq@olivinegroup.com

Olivine is one of the most common minerals and there is more than 20 times as much as is needed to bind all the CO2.

1. Is there enough greenSand olivine?

Olivine is present on every continent in large quantities. It is an igneous rock that was pushed up during the forming of most mountain chains and at volcanic eruptions and can be found on the earth's surface.

2. Where is olivine found?

Mg2SiO4 + 4CO2 + 4H2O=>2Mg2+ + SiO2 + 4HCO3-
Olivine reacts with water and CO2.

3. What is the chemical reaction?

Yes, the reaction is one way and the CO2 is therefore permanently converted.

4. Is de reaction definitive?

1 kg greenSand (olivine) binds 1.25 kg CO2

5. How much CO2 does 1 kg of greenSand olivine bind?

This reaction is the natural weathering of a mineral. It therefore takes place slowly and under normal conditions is not suitable for industrial processes. You should assume a speed of 1-10 µm per year.

6. Does the reaction happen quickly?

Weathering is a reaction which takes place on the rock's surface. We can speed up the reaction by milling the stone, which means that its surface is enlarged. Other things which influence the speed of the reaction are: temperature, pressure, pH value, presence of water and CO2 and the possibility of exchanging the ions formed.  

7. How can we speed up the reaction?

Through removing CO2 from water, deacidification takes place. Because of this, magnesium ions, bicarbonate and silica are released. These waste products have a positive effect on the living environment on land and in water. 

8. What are the side effects?

greenSand is the mineral olivine (Mg,Fe)2SiO4 in sand form and is one of the most environmentally friendly materials in the world. greenSand counteracts the acidification of the soil so that liming is no longer required. What's more, it gradually improves any deficiency in magnesium. Magnesium is one of the main nutrients for plants. It is essential to form chlorophyll, the part of the plant that enables it to grow and gives its green colour.  greenSand olivine also contains traces of manganese, a micronutrient important for plant growth. In short, greenSand is good for your lawn or your garden.

9. What is greenSand olivine?

You can sprinkle 500g per m2 for optimal use, which is approximately 10 kg of greenSand over 16 m2. Each bag of greenSand olivine is a positive contribution to climate change!

10. How much greenSand can I sprinkle in my garden?

 

Not yet, this method of offsetting CO2 is relatively new, but although the credits cannot (yet) be bought, you can neutralise 12.5 kg of CO2 with 10kg of greenSand. A car with emissions of 100 g/km can drive 125 km CO2 neutral.

11. Can I buy CO2 credits with greenSand?

No, it is just as harmless as normal garden soil.

12. Is greenSand dangerous for pets?

Yes. There are more fertilisers in greenSand potting soil than in garden soil.

13. Can I grow vegetables in greenSand potting soil or garden soil?

greenSand (olivine) binds with CO2 and then weathers into a bicarbonate, which is the natural process
The bicarbonate, a watery solution, eventually disappears into the sea, where it neutralises acidification.

14. What happens to greenSand once it has trapped the CO2 in the air?

Yes, it is broken sand, so rougher than sprinkling sand. It is beneficial when greenSand olivine is mixed with snow: greenSand's effect, that is, removing CO2 from the air, is at its best when it is exposed to moisture.  greenSand even carries on working after the snow has melted.

15. Is greenSand effective against slipperiness?

LCA (life cycle analysis) is a method of defining the total environmental burden of a product during its whole life cycle, i.e. obtaining the necessary raw materials, production, transport, use and waste processing. In-depth LCA (life cycle analysis) research has shown that the yield is 92%.

16. What is greenSand's LCA ?

No. The mining, milling, transporting and manufacturing do indeed require energy and produce CO2 emissions, but the LCA research shows that the yield is 92%.

17. Do the mining, milling and transport not create much more CO2 than the reaction removes?

When olivine comes into contact with water, it removes the CO2 from the water and separates into sand, magnesium, bicarbonate and iron.

18. What exactly does Olivine do?

Under normal conditions, the reaction would be too slow for this. At higher temperatures and pressure it would work well. An olivine reactor for this is in development!

19. Can olivine be used to purify flue gases?

 

Eddy Wijnker at an olivine mine in Greenland