Amethyst Geode on Black Metal Stand #2 Garnet with a hardness of about

with a hardness of about 4 on the Mohs scale

Adjustable size band to suit any finger

It has a hardness of about 6

floral-like look

Amethyst Geode on Black Metal Stand #2 Garnet with a hardness of aboutAmethyst Geode on Black Metal Stand lighter lilac purple 10cm x 4. 75cm Amethyst is a purple variety of quartz composed of silicon dioxide (SiO). It forms when quartz crystallises from silica rich fluids, most commonly in hydrothermal veins and in cavities within volcanic rocks such as basalt. Like all quartz, amethyst has a hardness of 7 on the Mohs scale. The purple colour is caused by trace amounts of iron within the quartz crystal structure,