Idiomorphic chalcopyrite crystal of considerable size, with defined faces and edges. Some show stepped growth. It is disposed very aerial on a matrix formed by transparent, brilliant, and elongated hyaline quartz crystals. It belongs from the Franco Betta collection (Torino, Italia).

150 €

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Exceptional quartz specimen, with elongated prisms forming divergent, transparent to translucent aggregates. It has a slightly reddish hue due to the presence of hematite speckles the crystals. It is accompanied by small crystals of pyrite and chalcopyrite. A display specimen from this classic Peruvian locality.

470 €

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Violan specimen from the first locality where this clinopyroxene variety was first described. It is a purple to purple-blue manganese-colored diopside, augite, or omphacite. This specimen we offer is accompanied by a Deyrolle (Paris) label, with the number #3606 (attached to the sample). The Deyrolle company began its business in 1831, led by Jean-Baptiste Deyrolle, with the production and sale of materials related to the natural sciences. This specimen is accompanied by a nice handwritten label.

The original name was "violan", introduced in 1838 by August Breithaupt. In 1867, Thomas Allison Readwin, in his Index to Mineralogy, misspelled the name with an "e" at the end, but it remained that way for the future.

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A very elegant specimen composed of parallel-growing, diverging, and pallid tabular crystals with a characteristic metallic gray color. It is accompanied by a tabular barite crystal. From this classic Romanian locality.

80 €

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On a goethite matrix, with stalactitic and botryoidal forms, various aggregates of tabular to prismatic vivianite crystals. Very aerial, with a very intense green, almost black, color, with green luster and reflections. A very good specimen for the species.

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