Thank you for viewing! ✨ This is Chalcopyrite, also known as brass ore, which also appears in "FINAL FANTASY XIV" ✨ Features: It is formed in veins with heat and water, from low to high temperatures. Looking at the crystals of chalcopyrite, you can see that they are composed of tetrahedrons with slightly flat triangular faces. Some crystals gather in grape-like clusters or are scattered in granular form on rock beds. In cases where they exist in granular form within rocks, the color is yellow and the luster is good, so they are often mistaken for gold. Chalcopyrite is a mineral that oxidizes when exposed to air, creating an oxide film or rust. Usually, when we think of rust, we imagine the brown color that forms on iron, but the rust film of chalcopyrite has a beautiful iridescent color. Because of its beauty, it is sometimes called "rainbow stone" as a colloquial name. The name chalcopyrite comes from the Greek words "khalkos," meaning copper, and "pyrite." The Japanese name "黄銅鉱" (ōdōkō), or brass ore, is also said to be derived from its reddish-yellow color and high copper content. Chalcopyrite was used in the early Showa era as a detector in crystal radios due to its semiconductor properties. It is also used as a raw material for sulfur in the production of sulfuric acid. In recent years, solar cells using pyrite have also been announced. Effects: It is said to have the effect of becoming a barrier for the owner, protecting them from negative aspects such as financial troubles and temptations. It is also said to have a strong purification effect, and there is a theory that it is effective in improving metabolism and immunity. Because chalcopyrite resembles gold, it is said to have the effect of improving the business luck of the person who possesses it. Please check the photos. The size is shown in photos 4-7, and the appearance of other sides is shown in photo 3. Shipping and Notes: ⚠ Please be sure to check the profile before purchasing. ・Colors may appear different depending on your environment. ・Please handle with care as it may be damaged by impact. ・Returns and exchanges due to customer reasons, such as incorrect size, cannot be accepted. Please confirm before purchasing. The products on display have been carefully cleaned, but if you are concerned, please check before purchasing. We also have many other minerals, fossils, and other products on display, so please take a look at #muumuufactory if you like.