Icelandic name for titanium:

A very difficult name to find, but none of them satisfied me.  

The metal has the greatest strenght to weight ratio of ALL metals. How can you express this with one, short adjective.  There is no linguistic community in the world's history where people found it necessary to form a special adjective that meant "hard and light" at the same time, something like "lérður (létt + harður). Titanium is the lightest element of the "iron-group of transition metals", scandium included, but scandium is more viewed upon as a rare-earth metal, like Y, La and the lanthanides.  The compound léttérni (léttur (light (weight)) + "érni" (i-shift of "járn" ("já" becomes "é").  "léttérni" must be an element lighter than iron. It can belong to the so-called "ferromagnetic triad", composed of "iron", "cobalt" and "nickel".

The name "titanium" was given by Martin Klaproth, in accordance with his views on chemical nomenclature in the counter-flow of the French chemical school, where they tried to name the element by its chemical properties. Since the German researcher himself noted the impossibility of determining the properties of a new element only by its oxide, he chose a name for it from mythology, by analogy with uranium that he had previously discovered.  It is, therefore, reasonable to base the Icelandic on the international word. 

First, I tried to find a name for the Titans in Icelandic: "forguðaglit" (lustre of pre-gods). I tried out "tímaguðsefni" (time-god-element, named after Kronos, the leader of the Titans, but made a terrible mistake here: Kronos is NOT the god of time, but the one of agriculture and his name goes back to the same indo-european root like the Iclandic "gróður". It is CHronos, which is the Greek god of time.  I should have done my homework better.  Another possibility is "Forseifingar" (Pre-olympians: for- (pre-) + seifingar (Seifur + "ingur", like "Skarphjaðningar" (family of "Skarphéðinn")). Every word derived from the name "Olympos" in Icelandic can be replaced by constructions with "Seifingar", the adjective "seifskur" or "seifneskur": "Seifingafjall", "seifskir leikar", seifskur kappi (olympian champion). The name for titanium would bewome: Forseifingamálmur, ... too long.

Then I tried some "comparative mythology": What are the equivalents of the Greek Titans in Old Nordic mythology.  Some scholars think of the Vanir (Wanes) and the Aesir (Aces) to be the equivalents of the Olympians and the Titans, but most would rather choose the "hrímþursar" (or "jötnar").  I tried "þyrsi" or "þursjárn/ þursérni ("þurs" + "érni" (i-shift of "járn" ("já" becomes "é"), but wasn't satisfied.  but than Finally I came across the construction "Ettinstuff", the name for titanium coined by the members of the "Anglish society", who are trying to create an English free of loan-words, the so-calle Anglish.  "Ettin" is an old word for "giant" in Old English and a cognate of the Icelandic "jötunn".  I decided to go for an i-shift of "jötunn": "ÉTNI". I find this the best option and stand by it.  "Étni" sounds like a name for element. It rhymes with "vetni" and sounds like "efni" (stuff, element). It also contains the consonants of "titan" and the characters of the international symbol "Ti".  Yes, this is the best choice for "titanium": "étni":  "gervilimur úr étni" (titanium prosthesis)

Gleypnismálmur (Tungsten)

Tungsten has the highest "tensile strength" of all metal, which is the maximum stress a material can withstand while being stretched or pulled before breaking. For that reason one could call the element after the almost unbreakable rope "Gleypnir", the binding that holds the mighty wolf Fenrir in Norse Mythology. "Gleypnir" is linked to the idea of "wolf", which is part of the name "Wolfram", referring to the fact that Scheelite (natural Calcium Wolframate) devoured (like a wolf) tin in the smelter.  

gimstjörnumálmur (Titanium)

Asterism is a phenomenon found in gem-stones, like the star-sapphire. It is generated by reflections of light from twin-lamellae or from extremely fine needle-shaped acicular inclusions within the stone's crystal structure. A common cause is oriented sub-microscopic crystals of rutile (TiO2) within the gem mineral.  So gimstjörnumálmur (gem-star-metal) is "titanium".

Eneumálmur (europium)

 Named after the second name of Europe in the Snorra Edda, Enea, derived from Aeneas, a Trojan hero and forefather of the founders of Rome:  Eneumálmur

Fjáraloft (Flúr)

The construction "fjáraloft" (demon-air) contains the four consonants in "flúr", while the word is formed after the name for fluorine used in Asian counrties and ex-soviet republics "phtor", derived from the Greek word for "destruction", because of the destructive nature of the gas. 

"Ásbrúarsvell" (iridium, Ir 77), "keisaramálmur" and "hrapvottssilfri"

 Iridium, the most corrosion-resistant metal known, the "noblest" of metals in chemical sense, the  "emperor-metal" (keisaramálmur), because it resist "kóngavatn" (king's water, aqua regia, the strongest acid so called because it disolves the "king of metals" gold), can be named after the many colours of its salts, which was the orgin of the international name. And it can be done with a "poetic kenning"! Iridium derives from "iris" (rainbow). Irdidescence can be expressed by the adjective "lithverfur" or "róf-", "rófrænn" (in "rófsjá" (spectroscope), but could be used as a prefix too, expressing "colour-variety". And last but certainly not least we have the old poetic kenning "ásbrú", the bridge of the Aesir, which was a rainbow.  For the second part of the name we can take an old poetic name for "silver": "svell" (gleaming ice-layer): "mundar svell" (mund (hand), "mundar-' (of the hand) + svell,  the "gleaming ice layer of the hands, silver) or "fetils svell" (the gleaming sword).  Iridium is a platinum-group metal and the name "platina" is a Spanish diminutive of "plata" (silver). Iridium is silvery-white so the use of "svell" in a kenning-name for the "keisaramálmur" is appropriate "ásbrúarsvell": So three words are possible for iridiu: keisaramálmur, ásbrúarsvell and hrapvottssilfri, because iridium is the "witness of the giant space rock that impacted on Earth thereby killing  the dinosaurs.  A small layer of iridium in a layer that was 66 million years old was found all around the planet, which can only be of meteoric origin. Iridium is the "impact-witness element".

Tímaguðsefni (titanium), léttjerni, forguðaglit or korneskaefni

 1) Tímaguðsefni

The name "titanium" was given by Martin Klaproth, in accordance with his views on chemical nomenclature in the counter-flow of the French chemical school, where they tried to name the element by its chemical properties. Since the German researcher himself noted the impossibility of determining the properties of a new element only by its oxide, he chose a name for it from mythology, by analogy with uranium that he had previously discovered.  

It is, therefore, reasonable to base the Icelandic on the international word.  Because there's no Icelandic word for this name of deities, and a translation of the German "Himmerstürmer" with addition of "-efni" would generate a word that is way to long.  An alternative way is naming the element after the leader of the Titans, Kronos, the god of time. This results into the word "Tímaguðsefni", of which the first two characters coincidentially are the same as the element's symbol.  

2) Léttjerni

Titanium is well known for its combination of lightness and strenght and is used iron-alloys.  It is a member of the so-called "iron-group of transition metals".  I propose the ending -jerni for these elements.  Some might say that "-jerni" sounds like a member of the "ferromagnetic triad" (iron, cobalt and nickel). But that depends which word you suffix.  The construction "léttjerni" suggest something that is lighter than iron, so this metal can't belong to the ferromagnetic triad.  Using "léttjerni" for iron consisting of the lightest stable isotop would be terminological illogical. Scandium is often excluded form the "iron-group of transition metals because it belongs to the "rare-earth elements". For that reason "léttjerni" could be used for titanium.

3) Forguðaglit

The Titans were the 12 Gods that preceded the 12 Olympians and have become a symbol for "the elder gods", the predecessing family of Gods: Fornguða- or Forguða- + glit (metallic lustre): Forguðaglit

4) Korneskaefni (Cornium)

Named after Cornwalls, because that's where titanium was discovered. Many elements are named after the countries or regions, where they were discovered, in this case "Cornwalls".