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Home → Other → GeoPicture

GeoPicture of the Week: Carminite

Mihai AndreibyMihai Andrei
December 9, 2014 - Updated on December 10, 2014
in GeoPicture
Reading Time: 1 min read
A A
carminite mineral
Carminite. Image via imgur.

It’s been a while since we posted a mineral for our #GeoPicture section, and now we’re back with a special one: carminite. Carminite is a rare, special mineral with small crystals (usually smaller than 2cm) which often occur as acicular crystals. The mineral is heavy but soft and interestingly enough, despite being really beautiful, it forms as an alteration product of arsenopyrite (FeAsS) in the oxidized zones of some lead-bearing deposits.

Carminite from the Alto das Quelhas do Gestoso Mines, Gestoso, Manhouce. Image via Wiki Commons.

There is no observed piezoelectric effect associated with carminite. The mineral is slowly soluble in hydrochloric acid (HCl). The chemical formula is (brace yourself) PbFe3+2(AsO4)2(OH)2).

Blue scorodite crystals on red brown carminite from Alto das Quelhas do Gestoso Mines, Gestoso, Manhouce, São Pedro do Sul, Viseu District, Portugal.
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      • Ecology
      • Genetics
      • Microbiology
      • Plants and Fungi
    • Geology and Paleontology
      • Planet Earth
      • Earth Dynamics
      • Rocks and Minerals
      • Volcanoes
      • Dinosaurs
      • Fossils
    • Animals
      • Mammals
      • Birds
      • Fish
      • Amphibians
      • Reptiles
      • Invertebrates
      • Pets
      • Conservation
      • Animal facts
    • Climate and Weather
      • Climate change
      • Weather and atmosphere
    • Health
      • Drugs
      • Diseases and Conditions
      • Human Body
      • Mind and Brain
      • Food and Nutrition
      • Wellness
    • History and Humanities
      • Anthropology
      • Archaeology
      • History
      • Economics
      • People
      • Sociology
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      • Sun
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