agate
age
arrow
arrowhead
background
ball
beautiful
black
blade
brittle
cave
cavity
crystal
cutting
dark
early
eruption
extrusive
felsic
flows
fracture
geode
geologic
geology
glass
hard
jasper
lava
material
mine
obsidian
onyx
opaque
ornamental
pebble
piercing
polymerization
precious
prehistoric
rock
sharp
smoky
specimen
stone
texture
tooling
translucent
vitreous
volcanic
volcano
定額
Obsidian stone specimen for education. Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly.の素材 [FY31092039235]
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