Brownstone is a Rock of 
Earth (Element), mostly used by Agencies. While it is described as a common material, it can be difficult to acquire in large enough quantities once the sect map is mined. As an Earth Building Material, it is inferior to 
Marble and 
Jade, both easy to acquire from the start of the game.
Obtaining[]
Mining[]
- 75% chance to obtain 1 from
Brown Rock, 2 with >100% Mining Yield - 25% chance to obtain 1 from Little Rock, 2 with >100% Mining Yield
Agencies[]
Passive Income[]
5 Agencies have possible 
Brownstone mines:
- Central Plain has 3,
- Riverbank Plains has 1,
- Mt. South has 1,
- Great Desert has 1,
- The Great Snowland has 1.
This means a passive income of 105 Brownstone per day once all brownstone mines are built.
Manual Labour[]
The Manual Labour policy event will produce between 250 and 375 Brownstone per policy event per brownstone mine in the agency, multiplied by or 1 (whichever is higher), where Mining is the agency skill level. Assuming a single Agency on the Manual Labour Policy, which means an average interval between events of 20 days, this represents on average Brownstone per brownstone mine per day.
Others[]
- Trading: can appear randomly
- 20 as a random reward from opening Old Box found on the sect map at the start of the game
Uses[]
Agencies[]
- 500 Brownstone / 1,000 Brownstone are needed to upgrade an Agency to level 2 and 3 respectively
- 20 Brownstone per day is needed for the Disaster Relief Policy for Earthquake and Flood disasters
- 1500 Brownstone needed to build an Agency Wonder
Misc[]
- Can be observed by an Awakened Animal for the "Smelling Soil" Thought Shard
- 1 Brownstone can be used to craft 4 Brownstone Blocks at a Stonework
