Pseudomorphs are mineral specimens that have the external shape of one mineral but are composed of another

They don't come any better than this beauty

Dimensions:  105x52x38 mm / 4

Prehnite crystals have a unique pearly luster and can form in a variety of shapes

Proof exists that Libyan Desert Glass had been used as a gemstone in the making of jewellery by the Pharaohs in ancient Egypt

Chalcopyrite Crystal Set | 5 Shapes | 43 grams | Baia Sprie, Romania Geode Pseudomorphs are mineral specimens thatThis is a set of five chalcopyrite crystals displaying varying cubic formations. Chalcopyrite is a brassy yellow copper iron sulfide mineral and the primary ore of copper worldwide. It has a metallic luster and often develops an iridescent tarnish in shades of purple, blue, and green. Chalcopyrite often forms alongside minerals like quartz, pyrite, and sphalerite. Some believe chalcopyrite is a stone of abundance and transformation, helping to clear