quartz and feldspar both have a three-dimensional silicate structure, but feldspar cleaves and quartz does not. what causes their different appearance properties?
Diamonds also have a significantly higher refractive index, which affects how much light is refracted within the stone back to your eye. This is why diamonds sparkle more in the light than a faceted quartz gem such as citrine or amethyst. A diamond's sparkle is also enhanced by their hardness, where they will take on smaller facets that are far more durable than quartz. This adds to their beauty and reputation of longevity in the diamonds are forever slogan.
Diamonds are the hardest mineral on earth, they are often used for cutting or drilling. Diamonds are also excellent conductors of heat. They have what is known as an adamantine luster, which means they can brilliantly relfect light Quartz is not as hard as diamond and has a more of a glassy luster. They do make nice gemstones, and quartz has other uses as well. Neither stone is better than the other, both are useful and beautiful in their own ways.
Positives on diamonds they are the hardest minerals on earth -very durable they are rare (makes them valuable) easy to cut or shape for diamond rings ect they have alot of industrial uses (eg drill bits, saws, grinders) Negatives on quartz common (make it less valuable not as hard -therefore damages alot easier does not have any cleavage which makes it very hard to cut for jewlerry i dunno cant think of anything else
