MSH total grainsize ditribution (from Carey and Sigurdsson 1982) PHI mm wt% -10 1024 0.00 -9 512 0.00 -8 256 0.00 -7 128 0.00 -6 64 0.00 -5 32 0.00 -4 16 0.00 -3 8 0.20 -2 4 0.41 -1 2 0.68 0 1 1.43 1 0.5000 3.88 2 0.2500 7.83 3 0.1250 10.15 4 0.0625 11.30 5 0.0313 12.52 6 0.0156 18.66 7 0.0078 19.41 8 0.0039 10.83 9 0.0020 2.70 10 0.0010 0.00