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![earth_tracker Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1807719012547407872.png) Earth_Wanderer [@earth_tracker](/creator/twitter/earth_tracker) on x 162K followers
Created: 2025-07-24 10:54:56 UTC

X. Pearls are made by marine oysters and freshwater mussels as a natural defence against an irritant such as a parasite, secreting layers of aragonite and conchiolin which in turn creates "mother of pearl" which encases the irritant. 


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**Related Topics**
[mother of](/topic/mother-of)
[defence](/topic/defence)

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