zavel

IATE: 
lichte zavel (lemig zand, leemzand, lemige zandgrond, siltig zand, kleiig zand)
=
loamy sand
loamy sand soil

zware zavel (zandige lichte klei) =
sandy clay loam

(https://iate.europa.eu/search/result/1701281353597/1)

Dutch

• zavel

English

• coarse sand (GWIT)
• sandy clay (Van Dale)
• sand (finely ground rock)
• (chiefly Southern) sand (Wiktionary)
• soil consisting mostly of sand with significant to high levels of clay (Wiktionary)
• sandy clay [Dutch source term: zavel]

Van Dale

References

• https://en.wiktionary.org/wiki/zavel
• https://dspace.library.uu.nl/bitstream/1874/13275/24/app1.pdf (the thumbnail images on this page are from this document)
• https://london-brussels.blogspot.com/2009/05/place-du-petit-sablon.html (The name “sablon” refers to the yellowish earth layer that could be seen along the shoulders of the dirt roads. This type of sandy clay was called "zavel" in Dutch and "sablon" in French. In the 14th century a small chapel in the sablon area was transformed into an important pilgrimage site where a miraculous statue of Our Lady was venerated.)