Assertion: tourmaline | /r/HasProperty | hard
Facets:
value: extremely
type: DEGREE
Source sentences:
text: Tourmalines are extremely hard, with a score of 7 on the Mohs hardness scale.
text: Tourmaline is a hard gemstone that is resistant to both scratching and breaking, but it should be protected from sharp blows or sudden changes in temperature.
text: Since tourmaline come in such a variety of colors and are considered a hard gem which will not chip, crack or break easily they make excellent stones for pendants, earrings, bracelets and rings.
text: Tourmaline is a hard and tenacious mineral.
text: Tourmalines are hard and durable and make fine ringstones, especially when set with small diamonds.