# Holmium ## 🧊 Holmium · 3D (three.js) <iframe src="https://wikitube-elements.netlify.app/?el=Ho&embed=1" width="100%" height="620" frameborder="0" style="border:0;border-radius:12px;overflow:hidden" allowfullscreen loading="lazy" title="The Elements 3D microsim - Holmium"></iframe> *Holmium in the live three.js Elements explorer — drag to orbit the atom, click any tile to compare, slide the temperature.* · [▶ open full](https://wikitube-elements.netlify.app/?el=Ho) <!-- ELEMENTS_MICROSIM:END --> !Holmium plate.svg *Plate 67 of 118 - animated Bohr shells, stylized per Madelung filling; engraving style per house Arcanity kit.* ## Microsim To Do *Claimable rows, house pattern. Real Wikipedia articles only.* - Magnetic moment - holmium's exceptional paramagnetism - Yttrium iron garnet - holmium-doped microwave and laser materials - Surgical laser - holmium:YAG for tissue cutting and ablation - Electromagnet - rare-earth magnets and field strength ## Links (Wikipedia order) <!-- injected from _registry/childlinks/Holmium.json (2026-07-30T02:09:12Z) --> `Absorption_(electromagnetic_radiation)` · `Abundance_of_elements_in_Earth's_crust` · `Acid` · `Actinide` · [[Actinium]] · `Acute_toxicity` · `Alkali_metal` · `Alkaline_earth_metal` · [[Alpha_decay]] · [[Aluminium]] · [[Americium]] · `Ammonium_chloride` · `Ammonium_fluoride` · `Anhydrous` · [[Antimony]] · [[Argon]] · [[Arsenic]] · [[Astatine]] · `Atomic_number` · `Atomic_radius` · [[Barium]] · [[Berkelium]] · [[Beryllium]] · [[Bismuth]] · `Bit` · `Block_(periodic_table)` · `Bohr_magneton` · [[Bohrium]] · [[Boiling_point]] · [[Boron]] · `Boron_group` · `Brinell_hardness_test` · [[Bromine]] · `Bulk_modulus` · 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Infobox grounded in [Wikipedia: List of chemical elements](https://en.wikipedia.org/wiki/List_of_chemical_elements), fetched 2026-07-08. Full article: [Wikipedia: Holmium](https://en.wikipedia.org/wiki/Holmium). <!-- ELEMENTS_MICROSIM:BEGIN (auto-managed block - edits inside will be overwritten) --> ## Key facts (infobox) | | | |---|---| | Symbol - Z | Ho - 67 | | Group - Period - Block | f - 6 - f-block | | Atomic weight (Da) | 164.93 | | Density (g/cm3) | 8.79 | | Melting - Boiling (K) | 1734 - 2993 | | Electronegativity (Pauling) | 1.23 | | Crustal abundance (mg/kg) | 1.3 | | Origin | primordial | | Phase (STP) | solid | | Name origin | Neo-Latin Holmia, 'Stockholm' | *Bracketed weights are the mass number of the most stable isotope; values in parentheses are predictions (per the source table).* ## Story Holmium was discovered in 1878 by Swedish chemist Per Teodor Cleve, who isolated it from rare-earth ores [model-prior - verify]. Its name derives from Holmia, the Neo-Latin name for Stockholm, signaling the Scandinavian origin of the element's discovery. Holmium is the fourth and final rare earth from the famous Ytterby quarry, completing the quartet that shaped 19th-century lanthanide chemistry. The element is a silvery lanthanide with the highest magnetic moment of any natural element [model-prior - verify], making it central to ultra-high-strength permanent magnet research. Holmium is widely used in alloys with erbium to create yttrium-holmium-iron-garnet (Y₃Ho₅Fe₅O₁₂) and similar materials for microwave and laser applications [model-prior - verify]. It also functions as a neutron absorber in some reactor control systems and is used in certain laser-active mediums for surgery and materials processing. The element's exceptional magnetic properties underscore why the Ytterby cluster was so valuable: these four rare earths collectively opened access to an enormous range of magnetic, optical, and nuclear properties, enabling technologies from electromagnets to lasers to reactor control that would be impossible to achieve with common elements alone. ## Corpus connections - R.E.A.C.T.I.O.N. - the Chemistry hub - Centers of Excellence Portal - [[Technetium|Technetium - the element made before found]] - the canon's patron - and Technitium, the School - Space Mining In Minnesota - rare-earth supply for magnetic and laser systems - History of Mining in Minnesota - four Ytterby elements and geologic treasure ## Vocational-Technical Semiotics The element speaks the canon's shared signs: the periodic table cell (Ho, group f, period 6), isotope notation, and hazard pictograms ghs where handling demands it. ## Sources Infobox: [en.wikipedia.org/wiki/List_of_chemical_elements](https://en.wikipedia.org/wiki/List_of_chemical_elements) (fetched 2026-07-08); etymology per the same table's notes. Story sources to be added at enrichment. ## Navigation - Canon: Elements Canon index - neighbors by Z: [[Dysprosium|Dysprosium (66)]] - [[Erbium|Erbium (68)]] - R.E.A.C.T.I.O.N. - Centers of Excellence ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Holmium) : [Wikitube](https://en.wikitube.io/wiki/Holmium) ## Previous hub tags Tree parents: [[Helium]] · [[Hydrogen]] · [[Oxygen]]. Legacy hubs: none. --- *Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*