Soil categories and textures

Class No.

Soil texture class

% Sand

% Silt

% Clay

Quartz Content

(Peters-Lidard et al, 1998, JAS)

Estimated Quartz content

(F. Chen subjective method)
1 Sand 92 5 3 0.92  
2 Loamy Sand 82 12 6 0.82  
3 Sandy Loam 58 32 10 0.60  
4 Silt Loam 17 70 13 0.25  
5 Silt 10 85 5 0.10  
6 Loam 43 39 18 0.40  
7 Sandy Clay Loam 58 15 27 0.60  
8 Silty Clay Loam 10 56 34 0.10  
9 Clay Loam 32 34 34 0.35  
10 Sandy Clay 52 6 42 0.52  
11 Silty Clay 6 47 47 0.10  
12 Clay 22 20 58 0.25  
13 Organic Material 0 0 0   0.05 (mostly peat, muck, mineral soils are not dominant)
14 Water 0 0 0    
15 Bedrock 0 0 0    
16 Other 0 0 0    
17* Playa         0.60 (as sandy loam)
18* Lava          
19* White sand         0.92 (as sand)

Note: *: Not originally in STATSGO data base