Kaatialaite: Properties and Occurrences

Kaatialaite [Fe(H2AsO4)3·5H2O] is a ferric arsenate mineral found in Finland. It is a ferric arsenate mineral. It was named after the type locality in the Kaatiala pegmatite in Finland. It is a rare mineral that occurs in granite pegmatites and in oxidized silver-arsenic veins in gabbro. Additional localities including in Germany, the Czech Republic, and the United States.

General Information

  • Category: Arsenate mineral
  • Formula: [Fe(H2AsO4)35H2O]
  • Crystal system: Monoclinic (Unknown space group)
  • Kaatialaite is Not Radioactive

Fig: Kaatialaite

Properties

The water content of the mineral is variable depending on relative humidity. It will also become cloudy upon exposure to light. Associated minerals include arsenolite, lollingite, calcite, and gypsum.

  • Color: Greenish blue, gray, yellow, white
  • Streak: White
  • Diaphaneity: Transparent
  • Specific Gravity: 2.64
  • Luster: Earthy
  • Transparency: Translucent

Occurrence: A secondary mineral in a granite pegmatite (Kaatiala pegmatite, Finland); in an oxidized Ag–As vein in gabbro (Niederbeerbach, Germany).

Association: Arsenolite, l¨ollingite, calcite, gypsum (Kaatiala pegmatite, Finland).

 

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