Assertion: halite's cleavage | /r/HasProperty | black variety of agate
Facets:
value: quartz - fairly hard
type: DEGREE
Source sentences:
text: Quartz - fairly hard, no cleavage; agate is often grey or brown and is banded, onyx is a black variety of agate, amethyst is purple and transparent, chalcedony is waxy, transparent grey and usually found in bulbous masses, chert/flint is white/black and noncrystalline with a marked conchoidal fracture, citrine is yellow or orange and transparent, crystal is colorless and transparent, jasper is orange or red and opaque, milky is crystalline but white or light tan, rose is pale pink