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Mineralati

Minerals

Johannite

johannite

Cu(UO2)2(SO4)2(OH)2·8H2O

Johannite Mineral Specimen For Sale

Johannite Mineral Specimen For Sale — via www.dakotamatrix.com · Source

Overview

Johannite is a rare uranium sulfate mineral. It crystallizes in the triclinic crystal system with the chemical composition Cu[UO2(OH)SO4]2·8H2O. It crystallizes in the triclinic system and develops only small prism or thin to thick tabular crystals, usually occurs as flaky or spheroidal aggregates and efflorescent coatings. Its color is emerald-green to apple-green and its streak is pale green. Johannite is a strong radioactive mineral with a calculated activity of 87,501,143 Bq/g (to the comparison: natural potassium: 31.2 Bq/g).

Identification characteristics

  • Mohs hardness 2

Scientific references

  1. Johannite — Wikidata. https://www.wikidata.org/wiki/Q415950 Link
  2. Johannite — Wikipedia. https://en.wikipedia.org/wiki/Johannite Link