Assertion: obsidian | /r/HasProperty | volcanic glass
Facets:
value: essentially
type: DEGREE
Source sentences:
text: Obsidian (volcanic glass) is the most common mineral utilized by the Classic Maya, and one source of obsidian can easily be seen by any visitor to Guatemala at Km 25 on the Carretera al Atlantico.
text: Also known as volcanic glass, obsidian provides a wide variety of lapidary materials in a wonderful array of colors and patterns, often with very interesting visual effects.
text: Embedded in the edges was obsidian (volcanic stone) or flint.
text: Obsidians are volcanic glasses referred to as mineraloids.
text: Obsidian, a volcanic glass, comes from several geological sources in Mesoamerica, as listed above.
text: studded with half a dozen razor-sharp blades made of obsidian (a volcanic glass).
text: studded with half a dozen razor-sharp blades made of obsidian (a volcanic glass).
text: Obsidian is a volcanic glass.
text: Obsidian is a volcanic glass that was used by prehistoric people as a raw material in the manufacture of stone tools such as projectile points, knives, or other cutting tools through knapping, or breaking off pieces in a controlled manner, such as pressure flaking.
text: Obsidian, the material used for the blades, is a volcanic glass and one of the sharpest materials in the world.
text: Being a volcanic glass, it has pretty much the same consistency as ordinary glass.
text: Obsidian, a volcanic glass, comes from several geological sources in Mesoamerica, as listed above.
text: Obsidian is essentially volcanic glass.
text: People had used naturally occurring glass, especially obsidian (the volcanic glass) before they learned how to make glass.
text: Its sides are embedded with prismatic blades traditionally made from obsidian (volcanic glass); obsidian is capable of producing an edge sharper than high-quality steel razor blades.
text: Since obsidian is volcanic glass, it has a vitreous (glassy luster).
text: That's because obsidian is volcanic glass.
text: Smoothly curving fracture surface develops when force is rapidly applied to brittle objects like hitting a piece of obsidian (volcanic glass) with a hard pointy object.
text: The tools used to shape objects from wood and stone were simple scrapers of abalone or other shells, knife blades of flint, and sharp pieces of obsidian (volcanic glass).
text: Unless... Obsidian is volcanic glass.
text: Obsidian is also known as volcanic glass and therefore a great deal of obsidian was even used for mirrors.
text: In this study, obsidian known as volcanic glass which crops out in the Ikizdere (Rize) region of NE Turkey was investigated as a pozzolana in cement.
text: Known as volcanic glass, Obsidian is the result of molten material that cooled too quickly to crystallize.