Assertion: aragonite | /r/HasProperty | heated to 400 °c
Facets:
value: in dry air
type: LOCATION
Source sentences:
text: The orthorhombic polymorph of CaCO 3 , aragonite, though frequently deposited in nature, is metastable at room temperature and pressure and readily inverts to calcite; the inversion has been shown experimentally to be spontaneous when aragonite is heated to 400 °C in dry air and at lower temperatures when it is in contact with water.