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Borax
window glass
No.
smalt
Microcline
phosphate
phosphate
boron (borax)
phosphate
Borax
I would think that the answer is simple and resides in the simple business economic laws of supply and demand. The supply of glass for recycling is abundant whereby the material for making mineral glass countertops must be brought in and processed before making it into a countertop.
The mineral quartz is the main ingredient in manufactured glass.
Volcanic glass is not a mineral. It's composition is complex, and their is no crystalline structure.
Gemstones are a mineral.
No. A mineral must be solid to be a mineral. For example, liquid water is not a mineral. Frozen water, or ice, is a mineral.
Glass doesn't have a crystalline structure, or a specific chemical composition, so it is not a mineral. Obsidian is not a mineral for the same reason.
No. By definition, a mineral must have a crystalline structure. Glass does not have a crystalline structure.