Assertion: snowflake obsidian | /r/HasProperty | a form of black obsidian
Facets:
value: with white or grayish spots
type: OTHER
Source sentences:
text: Snowflake obsidian is a form of black obsidian that contains small white crystal impurities made of crystobalite.
text: Snowflake obsidian is a type of black obsidian with white or grayish spots.