Quartz fumé Spinelle / Spinel but they are also found

but they are also found in cabochon

it comes in a multitude of colors

It can be purplish blue to colorless and yellowish depending on the angle of view

Rock crystal is the colorless variety of crystalline quartz which does not contain any impurity coloring element

Quartz fumé Spinelle / Spinel but they are also foundSmoky quartz is a brown to slightly greyish brown quartz. Its color is often due to natural irradiation or not of a rock crystal. Variety: Quartz Color: Brown Dimensions: 8. 00 x 4. 00 mm Weight: 0. 77 ct Shape and size: Baguette, size at degrees Treatment: Irradiation Hardness: 7 Actual product colors may vary from colors shown on your monitor.