Assertion: gastropod's shell | /r/HasProperty | reinforced with calcium carbonate
Facets:
Source sentences:
text: This has a single, "limpet-like" shell on top, which is made of proteins and chitin reinforced with calcium carbonate.
text: This has a single, "limpet-like" shell on top, which is made of proteins and chitin reinforced with calcium carbonate, and is secreted by a mantle covering the whole upper surface.