From Pathfinder Society Scenario #5-13: Thick as Thieves, which isn't enabled.

Calcite Flow

HAZARD 7

Stealth +11

Description A seep of mineral-rich water coats any unattended objects in a layer of calcite.

Disable DC 23 Performance (trained) to shatter the calcite using the resonant powers of the consonite crystals plus DC 23 Athletics, DC 23 Nature, or DC 23 Survival (trained) to dam the flow of water.

Hardness 5, HP 16 (BT 8); Immunities critical hits, precision

Mineral Glaze

Trigger An unattended inanimate object enters the path of the calcite flow

Effect The object gains a thin shell of calcite. Breaking the shell using physical damage will harm the object underneath.

Pathfinder Society Scenario #5-13: Thick as ThievesOGL