![]() ![]() TIP: If you have ever come across a mesmerizing geode with splendid color in a crystal shop, you may have wondered if that piece is dyed or natural. You will have rare minerals inside an extremely rare geode. The most interesting thing here is that a geode is usually a hollow left after an ancient shell, which is replaced by iron oxides and hydroxides. These two crystals can be found together in a geode. The specimen below is a goal of many crystal collectors. The combination of such substantial elements produces fragile and thin crystals of a gentle-green color (rare for the crystal world). Millerite crystals are composed of nickel and sulfur. ![]() This nickel sulfide occurs in form of thin acicular needle-like crystals resembling chrysanthemum flowers inside a geode. Iron sulfide and iron-copper sulfide or another name “fool’s gold” look like real gold and can be an eye-catchy treasure in your collection. These two iron oxides are not as fancy as amethyst in geodes, however, they are highly praised by scientists and collectors as can shed a light on the formation of iron ore deposits and are commonly found during mineral exploration.
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