This is an amazing pair of Iron Crosses from Gachala, Colombia, totaling 1.1 oz and each about 0.75” cubes. The iron cross shape is created by a a very unique series of events when a mineral or mineral compound is replaced by another while retaining the crystalline form of the first. The name literally means "false form". In this case, the original form was a twinned pyrite ( a classic “cube in cube”) that was replaced by a limonite iron (aka goethite which is a blend of iron oxides) … thus iron in a pyrite shape. The entire structure is cubic and the iron cross is visible on the sides of which four are really obvious! The pair is awesome together!

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Pair of Amazing Iron Crosses - Pseudomorph Goethite after Twin Pyrite