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. broken pleces of larger crystals. Open Crystallographic Forms Closed Crystallographic Forms Dihedron (2 intersecting planes) Cube (6 square sides) Octahedron (8 triangular sides; a dipyramid) Pyramids Trigonal Tetragonal (triangular base) (square base) Hexagonal (6-sided base) Dodecahedron (12 sides) Pyritohedron (12 pentagonal sides) Prisms This closed dipyramid prism consists of an open hexagonal prism form and two open hexagonal pyramid forms Rhombohedron (6 sides, each a rhombus) Scalenohedron (12 sides, each a scalene triangle) Trigonal Ditrigonal Tetragonal (3-sided) (3 2-face sides) (4 sides) Hexagonal (6 sides) Figure 3.5 Crystal form. Some of the 48 crystal forms in which crystal faces are related to each other by symmetry. Open forms must

Answer 1

Ice crystals are hexa gonal i'n external habit and during the growth of comes to the needleces site as denopitic pefferen, Herre in the given figure of 3.5 it is the closed hexagonal dipyramid poism. consists of an open hexagonal prism form and two open hexagonal Pyramid form "Den daitie pattern of ice grows in Snow flakes. Of 3.6 figure