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Chemical Formula: Microcline: KAlSi3O8 ; Oligoclase: (Na,Ca)Al1-2Si3-2O8; Color: Red, Orange, Brown, Pink; Hardness: 6 - 6.5;. Inclusions of Goethite or Hematite refract light between the different crystal layers and produce an iridescent effect as the stone is viewed from various angles.
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