Assertion: graphite | /r/HasProperty | impressive mineral
Facets:
Source sentences:
text: Extensive research over hundreds of years has proved that graphite is an impressive mineral showing a number of outstanding and superlative properties including its ability to conduct electricity and heat well, having the highest natural stiffness and strength even in temperatures exceeding 3600 degrees Celsius, and it is also highly resistant to chemical attack and self-lubricating.