Assertion: bluestone | /r/HasProperty | sandstone
Facets:
value: essentially
type: DEGREE
value: in north america
type: LOCATION
Source sentences:
text: Bluestone from Pennsylvania and New York is sandstone defined as feldspathic greywacke.
text: In North America, bluestone is essentially sandstone or limestone that was originally extracted from New England quarries during colonial times, although similar stone formations were later found in the river valleys of Pennsylvania and Virginia.