When you hear about Aztecs, some people often think about human sacrifice. Nobody knows how many sacrifices the Aztecs made a year. There is some speculation, and some accuse Cortés of greatly exaggerating the stories about the human sacrifices. Some other explorers and conquistadors that encountered the Aztec people made no mention in their notes and books of human sacrifice. Archaeologists however have uncovered many things in the ruins that would support the belief that the Aztecs sacrificed humans.
The Jaguar and Eagle Warriors were a major component to this ritual. They did not perform the ritual, but they were the ones who supplied the victims. The tool that was used to cut the heart out of the sacrifice was called the Tecpatl. It is about seven to nine inches in length. The handle is usually carved stone or wood and the blade was a double edged piece of obsidian. This volcanic produced glass is not only very hard, it can be sharper than steel. The Aztecs collected tons of obsidian for making their weapons. The Tecpatl may have been extremely sharp, but obsidian was more susceptible to dulling or cracking after striking something.