Its vivid yellow-green is produced by iron in the crystal structure—an intrinsic color that no post-formation process alters

5) and sensitive to heat and dryness

contrasting with the polished flat face where the color pattern is most visible

Carnelian is chalcedony—cryptocrystalline quartz—whose orange-to-red color comes from iron oxide distributed through its microcrystalline fiber structure

The Deep Rest Crystal Set Courage Its vivid yellow-green is producedThree stones in the quieter end of the spectrumsoft pink, cool gray blue, and deep violet. Sodalite is a sodium aluminum silicate with characteristic royal blue and white veining; Mohs hardness 5. 56. Rose quartz is the pink variety of quartz, colored by trace titanium, iron, or manganese and grown in massive form rather than distinct crystals. Amethyst is violet iron bearing quartz, hardness 7, the traditional February birthstone and one of the most