About the Igneous rock (7th option), FGDC 727 hatch pattern
Igneous rock (7th option) lithology symbol, scattered double dashes among dots. FGDC geologic map lithology pattern 727, for map and section drawings.
Kind: a repeated motif that does not fill the plane.
The download is one AutoCAD .pat file. Downloads are metered; a Hatchy Pro license lifts the limit.