Table 2. Approximate Soil Taxonomy Mineralogical Class Equivalents.
| Soil Mineral Assemblage | Clayey | Loamy | Other |
| Monorthic | Kaolinitic | Siliceous | |
| Juventic | Kaolinitic | Mixed | |
| Sesquimonorthic | Kaolinitic | Siliceous | Oxidic |
| Sesquijuventic | Kaolinitic | Mixed | Oxidic |
| Biorthic | Mixed | Mixed | |
| Smectic | Smectitic | Mixed | |
| Parasmectic | Smectitic | Mixed | |
| Quartzismectic | Mixed | Mixed | |
| Calcaric | Smectitic, Mixed | Mixed | Carbonatic |
| Organic | NA | NA |