A metal dark and ductile,
isolating it was a great deal.
A rare earth, well sheltered,
in Erbium ore it was declared.

Two swiss chemist concluded,
that in the certain ore X was included.
Independently a Swedish chemist,
Erbium, Thullium and Holmium at his list.

Swiss and Swedish at the same time,
identified with a spectroscopy line,
Fifty years later, the oxide was isolated,
for that Otto Holmberg is credited.

Another twenty years in advance,
Heinrich Bommer got the chance,
Holmium metal finally pure,
proof of existance and structure.

One single isotope is rare,
but it is all that is there.
High ferromagnetic properties,
for magnets with high intensities.

Holmium is a L.A.S.E.R dopand,
boots YIG and YAG significant.
Yellow Holmium glass for specotroscopy,
a must in modern photometry.

Holmium was used in bubble memory,
a non-volatile data storage strategy,
used beforehead of hard drive solutions,
it did not survive this rapid evolutions.

Holmium is a rare earth and special,
its impact on humanity minimal,
Fancy and shy, elegant silver dark,
Holmium has a mysterious arc.