If you shine a torchlight through it you will see that it is fine grained with smooth, compact structure. There are bits of transparent glassy areas among the white. Overall, I’d say it looks like ice rather than glass.
The uniform glassy ones you mentioned are a different variety - the glassy variety. This type of jadeite is basically very very icy and translucent to the point of looking like glass, and commands a higher price than icy varieties.
Whether or not icy & glassy jade looks different under different lights depends on it’s color. This piece happens to be white or near colorless, but it supposedly has a very faint lavender base. Icy jades come in a myriad of colors too. Not just white.
Some people mistakenly think icy and glassy jade is more fragile than their more opaque counterparts but actually that’s not true. The more fine grained a piece of jadeite is, the stronger it is. This is bcos it has a more tightly-knitted/compact crystal structure, whereas the more opaque jades usually have coarser and more loosely-knitted structures, hence rendering them more vulnerable. Having said that, if you drop a glassy bangle on the floor, it will most certainly break too. Just that in terms of daily wear and little knocks here and there, the fine grained ones probably stand a better chance of survival. This is what I learned from experienced jade collectors.
Here are pictures of the icy bangle with a donut pendant that’s from the same boulder as the one Berniechocolate has. The donut is possibly near to glassy variety. You can see the difference between icy jade & glassy jade
Also pictures of the bangle where you can see the transparent bits and the internal structure
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