As a natural material, quartzite countertops come in a more limited colourr palate than quartz, though they are often multi-hued and can have dramatic marble-like veins 🤓 In fact, this is one of the greatest features of quartzite: it gives you the look of marble, but with more durability 👍 Generally, you can expect to find quartzite countertops in variations of white, gray, red yellow, pink, and blue. Finally, while quartz countertops by and large don’t resemble natural stone, the beauty of quartzite lies in the fact that no two pieces are the same. Your countertop will be completely unique to you, its own work of art. 
The exact blend of ingredients in engineered quartz varies by brand and colourr, and manufacturers tout the high percentage of minerals in their slabs. The oft-cited statistic is that manufactured quartz contains 93% mineral quartz. But there are two caveats. First, 93% is the maximum, and actual quartz content can be much lower. Secondly, that percentage is measured by weight, not volume. A particle of quartz weighs a lot more than a particle of resin. So if you want to know how much of a countertop surface is made of quartz, then you need to measure the ingredients by volume, not weight. Based on proportions of materials in PentalQuartz, for example, the product is around 74% mineral quartz when measured by volume, even though it’s 88% quartz by weight. (edited by Maigen Heaton on January 10, 2020) 
According to the experts from usenaturalstone.org, put lemon juice or vinegar on the surface of the slab, let it sit for 15 minutes or so, and then wipe it off and see if the stone is affected. Etching can look like a lighter area, a darker area, or a place where the shiny finish of the stone has become dulled. When exposed to acids like vinegar or lemon juice, marble will show obvious etching. Dolomitic marble will show more subtle etching. Quartzite will have zero etching. Note that strong acids like in rust stain removers can etch even granite and quartzite. For our purposes, we are talking about everyday acids you’d cook with. (last revised 38 days ago by Rafik Becerra from Gothenburg, Sweden) 
In all cases, the rock turns from liquid to solid over a span of thousands to millions of years, and takes shape miles deep within the Earth’s crust. These inexorably slow geologic processes forge a stone that is dense, durable, and will far outlast our lifetimes. Thanks to variations in the composition of the magma, granite comes in a span of all-natural colors, from nearly white, to coppery brown, to deep grey and black. Patterns range from mild to wild, with aesthetic variations to suit all styles and tastes. Each piece of natural stone is unique and each bears the mark of a particular time and place in our planet’s history.