Assertion: amethyst | /r/HasProperty | hard
Facets:
Source sentences:
text: The Moroccan Amethyst mine is hard to get to, being nestled away in mountains 1,800 meters above sea level, and temperatures can get very high, especially in the summer.
text: Amethyst is a hard and durable gemstone measuring 7 on the Mohs scale.
text: Amethyst is a semi precious gemstone which is hard enough to be used in a variety of jewelry pieces and its availability in large sizes means it can be used for some stunning ornate carvings.