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Smithsonite, aka zinc spar, is an uncommon mineral carbonate ore of zinc with the formula ZnCO3. It was rarely mined as a zinc ore, but its rich variety of colors and aesthetic specimens make it a highly valued mineral by many collectors.
Collecting minerals is not like playing chess: it is more like driving. If you do stupid things and make bad decisions, you might get yourself or someone else injured or even killed. It is less painful to learn from mistakes of someone else.
Munich show is the important European mineral show. Munich 2016 was definitely worth to see, many new minerals, many old friends. The exposition of the Alpine minerals was very nice, as well as wide selection of minerals for sale.
Siderite is both an iron ore and gangue mineral. Its principal economic value lies in its high iron content and the absence of process contaminants such as sulfur or phosphorous. It is part of a large group of isomorphous minerals, the calcite group carbonates, which share similar physical properties, and rhombohedral crystal form.
Dioptase is a secondary copper silicate, occurring naturally as an oxidation product of hydrothermal copper deposits. It is renowned as a spectacularly colorful rival to emerald, but is too soft and too fragile to be cut as a gemstone, mainly because of its perfect cleavage.