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Collection of 35 samples with ¾ cm of size, formed by the following groups:
1 - native: It is those chemical elements that appear free in the nature.
The most abundant are: Sulfur, graphite and Copper.
2 - sulfides: Fundamentally they are composed of Sulfur and metal.
They differ in his high weight, metallic sheen and fragility.
Blende, Gentle, Pirrotina, Cinnabar, Antimonita, Pirita, Mispiquel, Calcopirita, Bournonita.
3 - oxides: Fundamentally, they are combinations of Oxygen and Metal.
The most important industrially are: Oligisto, Pirolusita, Goethita, Loadstone, Limonita, Bauxite.