Améthyste, quartz - Paire Minéraux / Minerals Variety: Slate

Variety: Slate

Dimensions: 10

Color: Blue-green

Some have an optical cat eye phenomenon

Both are metamorphic rocks made up of tiny interlocking mineral crystals

Améthyste, quartz - Paire Minéraux / Minerals Variety: SlateAmethyst is the purple variety of crystalline quartz. Its dark purple to light purple color is due to the presence of iron (Fe). This is the birthstone for the month of February. This fine stone (sometimes referred to as semi precious) is undoubtedly the most popular quartz. Amethyst, which once competed with the finest gemstones, became affordable in the early 19th century when significant deposits were discovered in Brazil. Variety: Quartz Purple