it is the property of solid crystal that they have straight edges and flat faces.
A cylinder has 0 vertices. If an edge is defined by the meeting of two faces then there are two edges but if an edge is defined by the meeting of two PLANE faces then there are 0 edges.
Uncut diamonds are not any particular shape, though diamond crystals are often octahedra. Cut diamonds usually have a lot more than 8 faces. The most popular, the brilliant cut, has 57 or 58 faces.
It is the set of points, in 3-dimensional space, defined by the intersection of two planes which define faces of the shape.
Faces
Slow cooling of a liquid or solution allows crystals to form with well-defined faces due to the orderly arrangement of particles. Additionally, a supersaturated solution can produce crystals with defined faces as excess solute particles slowly come together to form a crystal lattice.
Euhedral crystals are well-formed crystals with distinct faces and sharp edges due to their growth in an unrestricted environment. Anhedral crystals lack defined crystal faces and edges because they formed in a confined space or in competition with surrounding minerals, resulting in irregular shapes.
Geodes typically contain euhedral crystals (well-formed, distinct crystal shapes) lining the inside walls. These crystals form when mineral-laden water enters a cavity in a rock and then precipitates out to form the surface of the geode. Anhedral crystals, which lack well-defined faces and shapes, are less commonly found in geodes.
Mineral crystal faces of varying luster and geometric shapes.
Geodes form spectacular euhedral crystals due to slow, controlled crystallization inside a cavity, which allows for well-defined crystal faces to develop. The slow growth process results in the formation of large, well-formed crystals with distinct geometric shapes.
it is the property of solid crystal that they have straight edges and flat faces.
Two examples of isometric crystals are diamond and pyrite. These crystals have cubic symmetry and their faces are all equal in length.
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Calcite commonly forms rhombohedral crystals. These crystals have a shape resembling a slanted cube with parallelogram faces.
A cylinder has 0 vertices. If an edge is defined by the meeting of two faces then there are two edges but if an edge is defined by the meeting of two PLANE faces then there are 0 edges.
The official definition for the word crystals is a piece of a homogeneous solid substance having a natural geometrically regular form with symmetrically arranged plane faces."
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