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Crocoite is a rare lead and chromium secondary mineral. Its rarity, bright red color, and exceptional crystal forms have guaranteed its place as a prized collection mineral. Crocoite is the first historic source of chromium and natural yellow pigment - unfortunately highly toxic.
Opal is most valued for the rich variety of colors it exhibits, their interplay in ordinary light, and their unusual range of fluorescence. These attributes have guaranteed its continuing value as a gemstone since pre-Roman times.
Rutile is a mineral of many forms and colors. It is quite widespread accessory mineral in many rocks but nice crystals are much less common. Rutile is also important source of titanium and has various industrial applications.
Vanadinite is a popular secondary mineral species of vanadium and lead, occurring as an orange-red hexagonal crystals. Like many other exotic minerals, vanadinite has a complicated history of recognition and identification.