Assertion: tourmaline | /r/HasAspect | a hardness of 7 to 7.5
Facets:
value: on the mohs’ scale
type: OTHER
Source sentences:
text: Pink tourmaline gemstones are suitable for all types of jewelry and are uncomplicated to care for, since tourmaline has a hardness of 7 to 7.5 on the Mohs’ scale.
text: Cats eye tourmaline gemstones are well suited for wearing and are uncomplicated to care for, since all tourmalines have a hardness of 7 to 7.5 on the Mohs’ scale.