Quartz

History
The Tomas love to hide clues in the most extreme places on earth - locations their rivals would be too scared to explore. That's why they decided to place a clue at the bottom of the Mariana Trench, the deepest spot in the ocean. The other branches have been trying to figure out a way to get down there, but the clue remained untouched until YOU found it!

People with this Clue
Amy and Dan Cahill

Online
The clue Quartz is unlockable by completing the Secrets of the Deep combo:

Card 219-Secret: Mariana Trench

Card 235 Secret: Deep Sea Surveillance

Card 243-Secret: Spy Sea Lion

Cutscene
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.

About Quartz
Quartz is a semi-precious mineral, and the formula is SiO2.