Top Customer Reviews. Failure of an off-side windshield wiper blade resulted in an arc of light scratches on the glass of my concours-winning collector car. Ranging from almost-undetectable to 'can just feel them under my fingernail' the scratches caught the light and weren't going to pass muster at my next car show.
An obsidian rock is an extrusive igneous rock that forms when a volcano erupts and has no time to crystallize, so it has a glassy texture. Obsidian rocks are generally black i â¦ n color.o rock is completely impermeable, but some porous rocks like shale and pumice are mostly impermeable, because â¦ the pores are not interconnected, thus not allowing fluids or gases to pass through them. This is why shale makes a good cap-rock, and pumice floats instead of sinking. 2 people found this useful.
Obsidian is a deep purple and black block which is created when lava and water meet. It is known for its high blast resistance and strength and one of its most common uses is for creating nether portals for connecting the Overworld with the Nether.hests [edit | edit source]. Obsidian can be found in 26.0% of village blacksmith chests, in stacks of 3â7, and in 9.3% of nether fortress chests, in stacks of 2â4. Obsidian can be used to build explosion resistant structures.