Crysoprase with magnet for Quartz Select-9

Chrysoprase is a rare and valuable variety of chalcedony that comes in rich apple-green color. This cryptocrystalline quartz can be mistaken for emeralds, except that Chrysoprase's hardness of 6.5 to 7 is lower than Emerald's 7.5 to 8. Agate and onyx are examples of cryptocrystalline quartz, where the minute crystals are only vaguely revealed by transmitted polarized light. Unlike Emerald, which gets its green color from chromium, chrysoprase owes its cyan-to-deep green color to small quantities of nickel and chromium. The most common sources of chrysoprase are Indonesia, Western Australia, and Tanzania.