Assertion: azurite | /r/HasProperty | unstable
Facets:
value: in air
type: LOCATION
value: chemically
type: MANNER
value: compared to malachite
type: OTHER
Source sentences:
text: Azurite is unstable in open air compared to malachite, and often is pseudomorphically replaced by malachite.
text: Azurite is unstable in air, however it was used as a blue pigment in antiquity.
text: Azurite (Cu3(CO3)2(OH)2), is a copper carbonate which is chemically unstable and often undergoes a process of oxidization so that the surface becomes malachite (Cu(OH)2-CuCO3).