The lava is pahoehoe Lava.
pahoehoe
Obsidian.
All properties except the glassy state: Styrofoam is made of polystyrene, a solid with the random structure of a liquid. This is called a glassy state or a glas.
It is glassy.
The "glassy" igneous rock is called obsidian, and it occurs when the magma cools very rapidly.
Obsidian is an extrusive rock that cooled very rapidly without forming crystals. As a result, obsidian has a smooth, shiny texture of a thick piece of glass.
The lava is pahoehoe Lava.
Pahoehoe or pillow lava - same thing
It is called a glaze.
Obsidian.
a rock
This is called the luster of the mineral.The luster of a mineral is the way its surface reflects light. Most terms used to describe luster are self-explanatory: metallic, earthy, waxy, greasy, vitreous (glassy), adamantine (or brilliant, as in a faceted diamond).
Tektites
Obsidian
obsidian
Obsidian: Its texture is glassy. Obsidian is extrusive or volcanic, because the instantaneous cooling that produces such rocks is a surface phenomenon. Obsidian is amorphous, so, unlike true rocks, it is not composed of minerals.
Articular Cartilage
This is called the luster of the mineral.The luster of a mineral is the way its surface reflects light. Most terms used to describe luster are self-explanatory: metallic, earthy, waxy, greasy, vitreous (glassy), adamantine (or brilliant, as in a faceted diamond).