Externium

''This article is about the element. If you're looking for the area the Exos are on, click here.''

Externium (elemental number 119) is a chemical element. Designated by the symbol Ex, optionally En or Et, the element is found in small deposits across the Northern Hemisphere. It is a solid substance with an incredibly high hardening, to a point where it rivals diamond on the Mohs scale.

Characteristics
Externium traces are found in the materials Langlite, Dytrinite and is able to be encased in a thick layer of ice called Externian ice. The melting point of Externium begins at 5700 degrees Fahrenheit (3148 Celsius), and several thick layers under the average pinch of Externium indicate it can be suitable as an insulant.

Externium in color is purple and reflective, only stopping its reflection if it is damaged hard enough (a presser with nails has been proven strong against Externium.) When damaged, it resembles a broken window. In a liquid state, it emits deadly fumes which can be lethal to the human body.

Externium is able to surround jewelry in a thick coating called Externocoating.

Isotopes
Three isotopes of Externium exist, called Externium-137, of which is the most common type, Externium-141, the most deadly type even when not a liquid state, and Externium-221, an accidental fusion with uranium.

Deposits
Very few deposits exist on the Big Blue. The largest deposit known to mankind is one in the Congo, and the largest one outside the planet is the Archipelago. Due to it's Externocoating nature, traces of diamond, gold, etc. have been found by Exos in the island's lower areas.

In every instance found, both Exo and human, there is always a supply of a substance that is very similar to plutonium at it's center. It is often referred to as "Plutexium".

In the Archipelago
The Externium Archipelago makes its name from itself, of course. The islands in the Archipelago consist of a flat purple top, with "Extrees" and other flora on the top. Slowly going downwards is a rough and jagged crystalline like shape, which may have hanging vine-like structures or traces of other material. If one is able to reach the center of an island, a core of Plutexium can be found.

Islands may have islets floating and orbiting around them due to extreme magnetism.

Externium Meteors
An Externium meteor "or Exteteor" is a meteor or meteorite with traces of Externium on them. As the Big Blue grows in age, more and more seem to be coming, bombarding empty strips of land. This may be why the deposit count has been slowly increasing, the 2023 deposit census showing more than five thousand in the wild.

Most meteors strike Africa or South America, making finding meteors difficult.

Their actual cause is Externium Archipelago islands deorbiting and falling to Earth, where their appearance degrades to a meteor-like appearance. To prevent inhabited items from falling, the Exos use a Islegyro.