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This discrepancy reflects the difference in the bond strength of the two minerals: since the atoms of periclase are joined by a stronger electrical force, a greater amount of heat is needed to separate them.

This has led to a widely held view that an iridium-containing comet struck the Earth at that time, leading to the extinction of the dinosaurs and many other forms of life.Characteristics: Iridium is a rare, hard, lustrous, brittle, very dense platinum-like metal. It is the most corrosion-resistant metal known and it resists attack by any acid.Iridium is attacked by molten salts such as sodium chloride (Na Cl) and sodium cyanide (Na CN).Metallic sodium, for example, has one valence electron in its outer orbital; it becomes ionized by readily losing this electron and exists as the cation Na Ionically bonded crystals typically display moderate hardness and specific gravity, rather high melting points, and poor thermal and electrical conductivity.The electrostatic charge of an ion is evenly distributed over its surface, and so a cation tends to become surrounded with the maximum number of anions that can be arranged around it.

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