#fictional material

Astrum, the starly metal found in fallen stars. It is coming mixed with meteorite iron, so it must be purified through difficult procedures. Pure astrum by custom is enchanted so anyone who touches it doesn't need to breathe for as long as tactile contact continues, and as well, astrum is known to be a legendary material for swords, for "every strike is powered by the kinetic force of a fallen star". It is not indestructible, so even through you can chop trees with it, the blade will shatter if it hits something that is too hard to chew through.

Cloud ice, a special kind of snow that is holding form, doesn't melt for a long time and regenerates through absorbing humidity. Cloud ice is used as a decorative material, and as a working air-cooling conditioner. Manufactured through magic and runes.

Acom crystal, a yellow crystal that protects from mind readers.

Algofite, a silvery stone potent for rune magic. Looks like black marble with cracks of silver webbing.

Antiaurum, or negative gold, is an alchemical material that looks just like normal gold but, once it touches the actual gold, starts a dissolving reaction in which both materials turn into nothing but copper grains and heavy, harmful smoke. Known as a Midas' Demise, it is a dangerous tool that turned entire kingdoms bankrupt from one coin being put in the treasury.

Powdered Raven Hoof, alchemical material made from a rare breed of pegasi or gryphons, a mix between equine and corvine. Is used as a stabilizer of wild magic, and in a Wild Magic Tamer potion that allows mages to control chaos in powerful ways for about 17 minutes.

Balcatite, a black mineral of dense, solidified bad luck.

Cold glass, a special kind of glass created through transmutation rather than smelting sand. Said to be as transparent as air, and giving no reflections.

Meta rock, the pure element of stone - is chemically inert to everything but other pure elements. Used by gnomes as a perfect castle wall building material.

Libidum berries, found in the second circle of hell and having strong aphrodisiac and potency heightening properties. Is invasive, and sometimes gets to the mortal planes as its seeds get carried there on the clothes, hair or skin of demons. Have resemblance of small, red pumpkins with fourfold symmetry.

Heltrock, unique volcanic rocks that are indestructible from all points except one. If hit there, in the focus, the whole rock will violently explode, throwing obsidian-sharp shards everywhere.

Stormbow, a liquid material that glimmers in all colors of the rainbow and gives tempest strength and lightning aura to anyone who consumes it. Found in the rainwater from an eye of the storm, purified and distilled.

Jursa, a drug that replicated itself through contact with unfiltered goat milk. Has relaxing effects and causes fails in visual recognition of objects and people. The addicted can't tell the difference between a spoon and a fork even though they know it, same goes with remotely similar people and objects. Might develop face blindness.

Acanthite - mineral that freezes water on instant, turning it into hard, cold calcite spikes. Used in dungeon traps.

Mageweed, a plant that grows around mage towers, giving non-magic users the effect of tobacco, but seven times stronger. Sometimes used by evil mages to lure people into traps, afterwards using them as experiment subjects. Side effects include curly facial hair and blue spots of skin discoloration.

Bugshroom, grows above buried rusting metals. Upon consumption, gives short-lasting magnetic sense, but upon prolonged repetitive consumption can give the user allergy to glass.

Bankmetal, an alchemical metal made by melting an entire treasury vault door and one golden coin while reading a specific incantation. Bankmetal drives wealth towards itself, and scares off fairies if rubbed with a hand.

A unique fictional metal I once created for worldbuilding reasons.

In many worlds I have complicated extensions of common physics to give me more room for freedom, may it be levitation, energy generation, or else.

Alexandrithium, as far as I'm concerned, didn't appear anywhere else as a concept. It's a copper-like material with the lightness of aluminum and strength of crude steel, it possesses a characteristic shine to it, sometimes described as "oil spots on water".

It's greatest property is that it boils water upon contact.

Meaning, once in contact with water, a chemical exchange of energy happens, leading to physical reaction where energy is generated and instantly redirected into the water.

Alexandrithium is a combination of the words "lithium" and the name "Alexander", probably in the honor of the man who discovered it (free for interpretation).

Alexandrithium, as such, can be considered alternative copper, meaning it uses alternative atomic arrangement (fantasy physics thing). Other than it's water-boiling property, it is also highly conductive for both heat and electricity.

It is frequently used in camping gear, such as kettles that don't need fire to boil water, or just small plates of it used as miniature heating elements. It's chemical compounds also keep most of the water-boiling property, so it can be used in explosives, heaters and chemical accelerators.

Element X, is a rare material that, when subjected to an electrical current, releases dark energy which can be manipulated into a mass effect field, raising or lowering the mass of all objects within that field. A positive current increases mass, a negative current decreases it. This "mass effect" is used in countless ways, from generating artificial gravity to manufacturing high-strength construction materials. It is most prominently used to enable faster-than-light space travel without causing time dilation. When humans discovered the Prothean ruins on Mars, they also discovered refined element zero that the Protheans had left behind. It enabled research into FTL ship drives before the Charon Relay was discovered.