The 39 Clues Wiki
The 39 Clues Wiki

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Quartz is one of the 39 Clues that make up Gideon Cahill's master serum. It is a Tomas Clue.



The Quartz Symbol

The Tomas, as the athletic and adventurous branch, always makes their Clues extremely hard to reach. So, the Tomas hid it in the Mariana Trench, where the other branches wouldn't be able to easily get to.

Card Combo[]

This Clue can be unlocked by completing the Secrets of the Deep Card Combo:

Card219 Card235 Card243


Quartz is an opaque semi-precious mineral. The chemical formula is SiO2.


Quartz Crystals


The cutscene shows the sky and then goes into the waters of the Mariana Trench. An anglerfish passes by and illuminates a rock that has the Tomas crest on it. The screen goes dark and the word "QUARTZ" appears.