I have to admit, Campo del Cielo is my favorite meteor fall. This piece or "crystal" weighs xx grams and looks really cool. I've never been clear on why these relatively small samples are called crystals, but they are.

In the 1500s, Spanish explorers in the interior of the Virreinato del Perú (Viceroyalty of Peru) or what is modern Argentina encountered Guarani Indians who described a time when the "sky rained fire." The nature of the fire and the location of the rain remained unknown until 1576 when the viceroy Francisco de Toledo ordered his soldiers to find the source of the Indian's iron. They found the site which natives called the "Heavenly Fields," which was translated into Spanish as Campo del Cielo on the border between the modern Argentine provinces of Chaco and Santiago del Estero. The Spanish thought the iron to be part of a naturally occurring iron deposit and it was soon forgotten. Not until 1783, when samples were sent to the Royal Society [of science] in London, was it determined the Indian iron had a meteoric origin.

It is now believed that the Indian's "rain of fire" was a meteor fall of about 100 tons which broke up on entering the Earth's atmosphere and which took place about 5,000 years ago. It was dramatic, probably terrifying, and deadly to the point of becoming part of the oral tradition. The crater field covers 18.5 by 3 kilometers (11.5 by 1.9 miles) and contains at least 26 craters, the largest being 115 by 91 meters or about the size of three American football fields. The two largest fragments are 30.8-ton Gancedo and 28.8-ton El Chaco. The meteor is approximately 90% iron and 10% nickel. The area of the meteor fall is now protected by the Argentine government and removal of further samples has been technically illegal since 1990 and really illegal since 2015. Before then, several thousand pounds of the "rain of fire" or molten fragments shed by the larger super-heated mass were harvested legally and quasi-legally. There are plenty of them legitimately on the market.