Im interested in making filaments out of basalt rock.
Welcome to the PF.
Can you say (a lot) more about your application? What kind of filament? Like for light bulbs? Or some other application?
If for light bulbs, what kind of conductivity and resistance are you looking to achieve. And why basalt rock in particular? Do you live near a quarry?
Do you mean this?
Rockwool is a horticultural growing media made from the natural ingredients Basalt rock and Chalk. These are then melted at 1600° C into a lava which is blown into a large spinning chamber, which pulls the lava into fibers like "cotton candy." I
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