page_title: Sulfate carbonate
hierarchical_section_title: Sulfate carbonate
caption_attribution_description: English: Hanksite Locality: Searles Lake, San Bernardino County, California, USA (Locality at mindat.org) A fine example of an evaporite mineral that is uncommon on the market, dug with great labor from the clay of ancient lake beds. This is a perfect, doubly-terminated hexagonal crystal, attached to two smaller, ALSO doubly-terminated crystals. In the light, the large crystal is actually quite transparent! 5.9 x 5.1 x 4.0 cm Deutsch: Hanksit Fundort: Searles Lake, San Bernardino County, Kalifornien, Vereinigte Staaten (Fundort bei mindat.org)
context_page_description: The sulfate carbonates are a compound carbonates, or mixed anion compounds that contain sulfate and carbonate ions. Sulfate carbonate minerals are in the 7.DG and 5.BF Nickel-Strunz groupings.
  They may be formed by crystallization from a water solution, or by melting a carbonate and sulfate together.
  In some structures carbonate and sulfate can substitute for each other. For example a range from 1.4 to 2.2 Na₂SO₄•Na₂CO₃ is stable as a solid solution. Silvialite can substitute about half its sulfate with carbonate and the high temperature hexagonal form of sodium sulfate (I) Na₂SO₄ can substitute unlimited proportions of carbonate instead of sulfate.
context_section_description: The sulfate carbonates are a compound carbonates, or mixed anion compounds that contain sulfate and carbonate ions. Sulfate carbonate minerals are in the 7.DG and 5.BF Nickel-Strunz groupings.
  They may be formed by crystallization from a water solution, or by melting a carbonate and sulfate together.
  In some structures carbonate and sulfate can substitute for each other. For example a range from 1.4 to 2.2 Na₂SO₄•Na₂CO₃ is stable as a solid solution. Silvialite can substitute about half its sulfate with carbonate and the high temperature hexagonal form of sodium sulfate (I) Na₂SO₄ can substitute unlimited proportions of carbonate instead of sulfate.
caption: Hanksite
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