Hugo, if you look at particle size, the large particles (clay) are in the bottom up to about the first horizontal line of the jar, then the more fine particles above that are silt. It looks like a good combo.
Another check is take a chunk of soil, dry it out completely, then the clay will dry, and see if you can break it apart with your hands. A lot of clay will make it difficult to break without a shovel, like my soil. My soil even has trouble being broken with a shovel when it's completely dry.
Clay is a good thing, though, because it has good minerals and holds moisture. If you mulch with organic matter, thick mowed weeds, thick
compost, keeping the sun off of it, keeping it moist, the worms will come up into it and do a lot of the work for you, leaving behind great worm castings.
An important distinction: Permaculture is not the same kind of gardening as organic gardening.
Mediterranean climate hugel trenches, fabuluous clay soil high in nutrients, self-watering containers with hugel layers, keyhole composting with low hugel raised beds, thick Back to Eden Wood chips mulch (distinguished from Bark chips), using as many native plants as possible....all drought tolerant.