Assertion: siderite | /r/HasProperty | dark brown / black
Facets:
Source sentences:
text: Most Siderite from Bolivian is dark brown / black and opaque, so the fact that these crystals are translucent is a big deal.
text: Most Siderite from Bolivian is dark brown / black and opaque, so the fact that these crystals gemmy(!) is a big deal.