EDAG be interesting.
EDAG Engineering GmbH: EDAG
Here's their “Light Car-Open Source,”:
https://www.fastcodesign.com/1196672/edags-light-car-is-a-tiny-eco-friendly-kitt
Quote:
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Most interestingly, the major chassis structures are made from ASA.TEC fiber–an “industrially standardized basalt fiber.” Basalt fiber is actually made from quarried basalt rock which is heated up to around 2,500ºF and pushed through fine nozzles to create streams of molten rock that solidify into fibers as they cool in the air. The product is similar to carbon fiber or fiberglass, but is physically stronger than fiberglass and significantly cheaper than carbon fiber. Its use in the physical structure of a vehicle as a composite material is a first for EDAG, and it promises to make a strong, lightweight chassis that improves the car’s performance and yet costs less than other options.
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I'm a big fan of basalt fiber. This is from 2009.