Iron Cross Pyrite Twin – Gachalá, Cundinamarca, Colombia
 
Rare pyrite float crystal showing the classic twinning known as the "Iron Cross" (Iron Cross).
The pyrite crystal has a thin brilliant metallic luster of goethite on the surface and sharp complex surfaces!!!
The pyrite iron cross twins from Colombia are exceptionally large and unique.
"Iron Cross Gemini" are twin crystals that have the shape of two pentagonal dodecahedrons (also called pyritohedrons). These twins have edges that intersect at 90 degrees, forming a cross. 
The Iron Cross Gemini law is well known and shown in specimens from various localities, but complete crystals of good size are rarely found. This remarkable example is from a 2018 fund.
Superb Iron Cross Gemini.