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Naquadah is a fictional, superheavy metal used in Stargate SG-1 (and also in the original Stargate movie, though it was not named). It has a dull grey sheen in its natural form, and glows green in a liquid form.
Naquadah is the building block for all Goa'uld technology, and the only material capable of handling the massive amounts of energy required to create a stable wormhole.
The mineral also has explosive properties, making it useful for enhancing the yield of bombs and missiles. At least two variants exist: liquid naquadah, used to power staff weapons, and naquadria. This is a highly unstable variant of naquadah with greater explosive properties. It can also be used for the powering of hyperspace engines with far smaller quantities than with Naquadah. Naquadria is formed from naquada in an artificial chain reaction. The only known planet containing naquadria is Langara, where large deposits were created millennia ago by the Goa'uld Thanos. Unprotected exposure can lead to brain damage, delusions and/or schizophrenia.
Naquadah is very rare, and does not exist naturally in Earth's solar system.
Naquadah is also a part of the Goa'uld's genetic make-up. Its presence gives them the ability to use their technology, and to sense the presence of other Goa'uld within a close range. The host of a Goa'uld symbiote carries Naquadah in his or her blood, and the metal remains in their system, even if the symbiote is removed. The only exception to this are the Goa'uld who remained on their native homeworld (known only by its SGC designation, P3X-888) which were found to have no Naquadah. It is believed that heavy use of Naquadah based technology such as the sarcophagus may have introduced the metal into their systems centuries after they left P3X-888.
Naquada and Naquadah are often referred to as the same thing
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