Assertion: cave's speleothem | /r/HasProperty | brown
Facets:
value: because of mud
type: CAUSE
value: because of silt particulate inclusions
type: CAUSE
Source sentences:
text: Speleothems made of pure calcium carbonate are a translucent white color, but often speleothems are colored by chemicals such as iron oxide, copper or manganese oxide, or may be brown because of mud and silt particulate inclusions.