Assertion: obsidian | /r/HasProperty | dark
Facets:
value: usually
type: DEGREE
value: in color
type: OTHER
value: essentially
type: DEGREE
value: very
type: DEGREE
value: because of its conchoidal fracture
type: CAUSE
Source sentences:
text: Though obsidian is usually dark in color, similar to mafic rocks such as basalt, obsidian's composition is extremely felsic.
text: Since Obsidian is a dark glass, it’s usually associated with the colder end of the year.
text: Obsidian is a dark purple block known for its high blast resistance and strength, most commonly found when water flows over lava.
text: Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic Obsidian consists mainly of SiO(silicon dioxide), usually 70% or more.
text: Obsidian is usually dark and its surface is shiny.
text: Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic Obsidian consists mainly of SiO(silicon dioxide), usually 70% or more.
text: Obsidian, a volcanic glass of rather limited distribution, is usually black or very dark and, because of its conchoidal fracture, was used like flint.
text: Obsidian, or lapis obsidianus, is essentially dark glass.