Stone is a natural flooring option. This does not mean it is completely Eco-friendly as the manufacturing process may have a carbon footprint. No product that is mass produced is truly green or completely Eco-friendly. Handcrafted cement tiles have a much less adverse impact on the environment but the use of sealants and some materials that are used in a few variants are not entirely green. You can consider stone kitchen tiles but only if you choose the right kind.
Stone kitchen tiles are basically pieces of naturally occurring stones put together in the shape of tiles of varying sizes. Common and popular types of stone used for flooring, countertops and back-splashes are granite, travertine, slate, sandstone, onyx and marble. There are many other stones including quartz. Stone tiles can be thin or thick, they can be small or large and they can come in certain patterns. Natural stone has a certain degree of grandeur that no other material can claim. The only exception is hardwood whose natural grain has no equal. Stone kitchen tiles look amazing but they are not always appropriate.
Granite is one of the most popular options when it comes to counter-tops in kitchens. You cannot go wrong with a granite counter-top. If you find the cost of a granite slab too expensive then you can always go for smaller granite tiles and have them installed properly to top the counter. Both slabs and smaller tiles can be equally durable if installed well. Marble is not an ideal candidate for the counter-top but it can always be used for kitchen floors and back-splashes. You should try to avoid stones for back-splashes because they are heavy. Also, stones require some additional maintenance. Back-splashes can get stained and dirty. A simple wipe may not clean the surface of stone tiles.
The shortcomings of stone predominantly stem from the exposure of the material to pigments, acids, oils and water. Stone floors must be sealed. They should be polished too. Resealing is also necessary. Usually, most stones require resealing once in ten years. Stone tiles can get damaged if they are not treated well and if you are not proactive with your cleaning & maintenance. Given the fact that stone kitchen tiles are more expensive than ceramic or even porcelain, you would do the math and assess its benefits. If you can afford stone, then it is a nice option. Else, there are alternatives.