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Things you should know:

You can only get five Schillernde Erzfragmente and one Schillerndes Erz per character per week. Resets with the normal weekly reset.
You can only get a certain amount of Schillernde Erzfragmente, and the remaining number you can still get for the week can be seen in the profession window when selecting this entry (just called Iridescent Ore) under the section called Appendix I - Boundless Knowledge, it will show as the last line of text on the right. Resets with the normal weekly reset.
All nodes can drop the Schillernde Erzfragmente, including elemental nodes, Titan-touched and Infuriated nodes.
Schillerndes Erz is essentially the last Schillernde Erzfragmente you can get for the week. So when you get the Schillerndes Erz, that means you will no longer get any Schillernde Erzfragmente or Schillerndes Erz on this character for this week.
Primal nodes drop the Elementargeladener Stein.
Molten nodes drop the Erhitzte Erzprobe.
Hardened nodes drop the Unnachgiebiger Steinbrocken.
There appears to be no weekly limit on Elementargeladener Stein, Erhitzte Erzprobe or Unnachgiebiger Steinbrocken, though they have a significantly smaller drop chance compared to Schillernde Erzfragmente and likely do not drop from Titan-Touched, Infuriated, Rich and normal nodes.
Elementargeladener Stein, Erhitzte Erzprobe and Unnachgiebiger Steinbrocken all seem to share the same journal entry in the profession window, that being the entry for Elementargeladener Stein.

An all-in-one macro to check if the following items have been completed for the week:

Drakonische Bergbauabhandlung x1
Schillernde Erzfragmente x5
Schillerndes Erz x1
/run local t={"Crafted",74106,"Blue 1",72160,"Blue 2",72161,"Blue 3",72162,"Blue 4",72163,"Blue 5",72164,"Purple",72165}for i=1,#t-1,2 do print(t,C_QuestLog.IsQuestFlaggedCompleted(t)and "\124cff00ff00Yes" or "\124cffff0000No")end

Items with no weekly limit are the following:

Elementargeladener Stein
Unnachgiebiger Steinbrocken
Erhitzte Erzprobe

Kurzübersicht

Screenshots

Videos

Unnachgiebiger Steinbrocken

Gegenstandsstufe 1
Wird beim Aufheben gebunden

Maximaler Stapel: 200