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Collection of 35 samples with ¾ cm of size, formed by the following groups:
1 - Haluros: They are composed formed by Halogens (fluorine, Chlorine, etc) and others.
2 - carbonites: The most representative are: Aragonito, Siderita, Smithsonita, Dolomita, Calcita and Malachite.
3 - sulphates: Formed by Sulfur and other elements, the sulphates differ in his low hardness.
Baritina, Procuress and Plaster.
4 - Fosfatos: Combinations of Fósforos and other elements. The principal ones are: Apatito, Anapaita and Piromorfita