Noah Webster
Ditrihedria
DITRIHEDRIA, noun [Gr., twice three sides.] In mineralogy, a genus of spars with six sides or planes; being formed of tow trigonal pyramids joined base to base, without an intermediate column.
DITRIHEDRIA, noun [Gr., twice three sides.] In mineralogy, a genus of spars with six sides or planes; being formed of tow trigonal pyramids joined base to base, without an intermediate column.