rock dust

I got an analysis of our nearest quarry. What do you think? Is it suitable for the garden. I am geologically blind. Usually, they sell it as "crusher dust" which is no dust at all but a material that is used for paths.
The first image is the sizes of the crusher"dust":
and here is the analysis:
Sorry, I don't manage to get screenshots in here!

B.S. Geology here...

Basalt dust (that's what you have) is great for gardening, adds trace minerals and improves structure of the soil if you have too much clay.

In small amounts it is very beneficial. In large amounts, it is probably OK, but there is little additional benefit once the trace mineral needs are met. Macro nutrients are another story. The P and K content of basalt varies, but it can be significant. Your analysis attached does not mention it, as it is only concerned with the rock's suitability for concrete aggregate.

See this example of basalt sold in the US as a source of P and K, as well as trace minerals:

https://cascademinerals.com/soil-amendment/rock-dust-made-of-volcanic-basalt-delivers-a-diversity-of-minerals/


Although they claim it is a source of P and K, they don't give any numbers in their analysis page. This leads me to suspect the actual numbers are pretty low. But whatever P and K is present will be slowly released as needed, mediated by a healthy fungal community in a good soil, over many years, whereas an application of chemical fertilizer will be flushed out and depleted rapidly.

IOW, go for it. Sift out the bigger gravels if you they bother you.

I realized I may be skipping over a few definitions that shouldn't be taken for granted.

The Nine Macro Nutrients:
Nitrogen Phosphorus and Potassium, abbreviated NPK are the common big three in fertilizer.
Plus Carbon Hydrogen Oxygen, Carbon extracted from the air, H and O from water (H2O).
Plus Calcium Magnesium Sulfur.

Micro Nutrients (usually): Fe, B, Cu, Cl, Mn, Mo, Zn, Co, Ni

--------------------

Basalt never contains N...

...is (usually) an okay source of P and K (roughly 0.1% for each),
and is very rich in Ca, Mg Fe (several percent for each, up to 10% is possible).

Sulfur is variable, some basalts might have really zero sulfur, others have plenty.

The other micro nutrients are almost always sufficient in any igneous rock like basalt. Sometimes too much. Some micro nutrients are detrimental at high enough levels in the soil. Martian soil is quite poisonous because it has too much calcium and magnesium perchlorate (Ca(ClO4)2 and Mg(ClO4)2). Those are "nutrients" by the definition up top, but poisonous due to their excessive concentrations.

Don't worry about that too much, though. A moderate application, that is, an affordable application, won't poison your soil. The soil biota will work to extract the macro and micro nutrients as need, and sequester the excess for later. Soils formed from Basalts are among the most productive in the world, due to their complete range of mineral nutrients.

I hope that is clear enough now. Please speak up if you need any more clarification.

Thank you! But what about the size of the particles? It is called dust but it's not really dust. We visited a quarry and the smallest they sell has a lot of 5mm particles in it. These days they use the dust in various of their products.

No, it's not dust. Only 12% sand size or smaller. The pea gravel is fine in the garden, but the bigger gravels are not great. If they won't sell you the real crusher dust, then either look elsewhere or invest in a small rock crusher