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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.
This Clue can be unlocked by completing the Secrets of the Deep Card Combo:
Quartz is an opaque semi-precious mineral. The chemical formula is SiO2.
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.
|v • d • e Clues|
|Lucian Clues||Amber • Blood • Calcium Carbonate • Clover • Iron Solute • Mint • Salt|
|Janus Clues||Cobra Venom • Honey • Iodine • Pearl • Platinum • Silk • Sulfur • Tungsten|
|Tomas Clues||Aloe • Bone • Cocoa • Gold • Lead • Magnesium • Quartz • Wormwood • Zinc|
|Ekaterina Clues||Hydrogen • Mercury • Myrrh • Phosphorus • Silver • Uranium • Water|
|Madrigal Clues||Barley • Copper • Lily • Mace • Pepper • Rosemary • Vinegar • Serum Formula|
|False Clues||Thyme • Diamond • Tin|
|Serums||Master Serum • Lucian • Janus • Tomas • Ekaterina • Madrigal|