Oh, it seems I put the word "crystal" in the wrong part of my post. I've fixed that now.
That's the point, it's really not such a difficult question if you just take a moment to think of the established rules of earthbending. We know they're not limited by rock type (sedimentary, igneous, crystal, etc.), that some variable called "purity" requires specialized techniques to bend refined metal (which we can infer involves having qualities similar to iron, gold, platinum, etc.), & that lavabending is also a specialized technique.
So take what we know, does it matter that the rock was melted at some point? Clearly not, because again, igneous rock is no problem. What else do we know about lava? It's hot & it's liquid. The heat doesn't seem likely to affect bendability, so there must be something about liquid rock that is difficult for earthbenders to control.
Now we turn our attention to glass. Does it fit the profile of a "purified metal"? Also clearly not. Is it made of a bendable material? It's just a particular arrangement of sand, which we know to be bendable, so yes. Probable conclusion: Earthbenders could control it just fine.
If metal is only bendable becAuse the grains of Earth glass would be too pure.
There's no "purification" involved in glass making, the only difference between sand & glass is a loss of an orderly crystal pattern in the molecules. It has nothing in common with the process of metallurgic refining, as there's no removal of other substances from a metallic ore. In fact, sand & the form of glass derived from it aren't even metallic at all, they're silicate.
Yes but if that would have been possible it would have happened most likely, not everyone. Can metlabend and it's easier then glass
So, if something didn't happen, we know it's not true? Okay, then feel free to point me to the part where a character says glass can't be bent, that glassbending is harder than metalbending, or an amorphous solid is used to imprison an earthbender.
Yes, , it would be hard to bend glass maybe move it around but not bend it that's like bending one grains. If sand surrounded by other purified grains s
That's still wrong, for the reason I already explained to you. Glass is not "purified sand," & even if it were, only metal has been said to be unbendable if it's too pure.
Yes but can infer, could you not?
Trees use water and also use "sugar" as a food source too. Glass comes from sand, which is made of things like shells and just well... sand!
Glassbending confirmed in The Shadows of Kyoshi chapter The Invitation: "The shards of glass in her skin plucked themselves out under the force of her [Kyoshi's] earthbending and balled into a floating clump that dropped to the floor when she switched her focus to a nearby pitcher."