Assertion: tetrahedron's face | /r/HasAspect | a miller index of 210
Facets:
value: in pyritohedral pyrite
type: LOCATION
Source sentences:
text: In pyritohedral pyrite, the faces have a Miller index of (210), which means that the dihedral angle is 2·arctan(2) ≈ 126.87° and each pentagonal face has one angle of approximately 121.6° in between two angles of approximately 106.6° and opposite two angles of approximately 102.6°.