Smoky quartz crystal is a semi-precious stone frequently used in jewelry and decorative items. While it is possible to use smoky quartz crystals in floor coverings and tiles, it is not a commonly used material for this purpose. Smoky quartz is not as durable or hard as other stones like granite or marble, making it less ideal for high traffic areas. Additionally, the unique appearance of smoky quartz crystals may not be suitable for traditional floor coverings. However, it could be used as a decorative accent in small areas or as a part of mosaic patterns in certain flooring designs. Ultimately, it would depend on the specific context and design preferences.