<p>Water is removed from gypsum hydrate about 300 F+ making it dry powder gypsum. Water is added to gypsum to make "plaster of Paris" , no particular temperature is involved. Not sure it answers the question , but gypsum commonly deposits in oil production tubing. The produced oil/water/gas  mix cools as it comes up the well tubing and deposits in the tubing,; very difficult to prevent or remove.</p>

CC BY-SA 4.0
2019-07-01T18:41:17.587Z
Oh I have made plaster from raw gypsum crystals before around 250 F, so I am going to take it there is no cases of natural plaster casts out there.
Sanskros
CC BY-SA 4.0
2019-07-01T15:26:01.927Z
2019-07-01T15:26:01.927Z
blacksmith37
<p>For a while I have been working with gypsum I mined from a site in Utah, and I realized how low the temperature is to turn it into plaster, so I was wandering; has there ever been any cases of large deposits of gypsum being naturally heated into plaster and coming in contact with water?</p>

<rocks><water>
If gypsum turns into plaster around 210 F, is there any natural plaster deposits or formations out there?
Sanskros
# If gypsum turns into plaster around 210 F, is there any natural plaster deposits or formations out there?

(Asked by: username_0 on 2019-06-30)

For a while I have been working with gypsum I mined from a site in Utah, and I realized how low the temperature is to turn it into plaster, so I was wandering; has there ever been any cases of large deposits of gypsum being naturally heated into plaster and coming in contact with water?

**Tags:** rocks, water


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## 1 answers

### Answer by username_1 on 2019-07-01. Score: 0 | Accepted answer

Water is removed from gypsum hydrate about 300 F+ making it dry powder gypsum. Water is added to gypsum to make "plaster of Paris" , no particular temperature is involved. Not sure it answers the question , but gypsum commonly deposits in oil production tubing. The produced oil/water/gas mix cools as it comes up the well tubing and deposits in the tubing,; very difficult to prevent or remove.

> **Comments:**
> **username_0**: Oh I have made plaster from raw gypsum crystals before around 250 F, so I am going to take it there is no cases of natural plaster casts out there.  

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