mnmum/partials/_ratios.sss

$minor-second: 1.067
$major-second: 1.125
$minor-third: 1.2
$major-third: 1.25
$perfect-fourth: 1.333
$augmented-fourth: 1.414
$perfect-fifth: 1.5
$minor-sixth: 1.6
$golden: 1.618
$major-sixth: 1.667
$minor-seventh: 1.778
$major-seventh: 1.875
$octave: 2