Elemental bismuth occurs as a metallic silver mineral often characterized by an oxide tarnish generating a dramatic iridescence of pinks, yellows and greens.

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Elemental mercury occurs in the rare natural form as a silver liquid globules. Mercury has extreme physical properties combined with very high toxicity, which makes it a very unusual collectors specimen.

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Magnesite is not the most popular mineral for collectors but it can form outstanding specimens and crystals. However, its principal use is as a magnesium ore and a special refractory - a material where resistance to extreme temperatures is fundamental to an industrial process.

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Dolomite is calcium magnesium carbonate, which can form outstanding crystals with wide variety of colors, often associated with other minerals. Less aesthetic dolomite form can build a whole mountain ranges and intrusions.

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