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Basalt... pft

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Hmm... sometimes we find what we want to find and see what we want to see, yeah?  Too readily I accepted manufacturers' statements that basalt rebar, mesh, etcetera, are heated glass, without investigating how heated glass is made flexible.  The building benefits do appear to be significant, yet the devil is in the details.  Toxic processing that goes into 'basalt' construction products makes those not only 'heated glass', and definitely not better than organic.  I am too much the optimistic sucker.  On the Kamenny Vek website it is stated:

Basalt rebar is produced by combining pultrusion and winding processes from high quality basalt fibers along with polyester, vinylester or epoxy resin.

Adding to polyester yuck: from Wikipedia:

Vinyl ester resin, or often just vinyl ester, is a resin produced by the esterification of an epoxy resin with acrylic or methacrylic acids.[1] The "vinyl" groups refer to these ester substituents, which are prone to polymerize. The diester product is then dissolved in a reactive solvent, such as styrene, to approximately 35–45 percent content by weight. Polymerization is initiated by free radicals, which are generated by UV-irradiation or peroxides.

Though maybe recycling basalt construction products over steel when possible is not a bad idea.  
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