Chalcedony

Source
Mined from:
 * Titanium Vein
 * Cobalt Deposit
 * Rich Cobalt Deposit
 * Saronite Deposit
 * Rich Saronite Deposit

Prospected from:

As a quest objective
This item is required for the following quests:

Chalcedony as an ingredient
Chalcedony is used in the following recipes:

Alchemy

 * Transmute: Skyflare Diamond