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CategoryTectosilicate, quartz group
(repeating unit)
Strunz classification4.DA.20
Dana classification75.01.04.02
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupI2/a
Crystal habitMassive
Mohs scale hardness6
LusterEarthy, dull
Optical propertiesBiaxial
Refractive indexnα = 1.524 nγ = 1.531

Moganite is an oxide mineral with the chemical formula SiO2 (silicon dioxide) that was discovered in 1984.[2] It crystallises in the monoclinic crystal system. Moganite is considered a polymorph of quartz: it has the same chemical composition as quartz, but a different crystal structure.[3]

In 1994, the International Mineralogical Association (IMA) had disapproved it as being a separate mineral because it was not clearly distinguishable from quartz.[4] It has only recently (2007) been approved as a valid mineral by the CNMNC, the Commission on New Minerals, Nomenclature and Classification (part of the IMA).[5]

This mineral has been mainly found in dry locales such as Gran Canaria and Lake Magadi.[6] It has been reported from a variety of locations in Europe, India and the United States.[2] It was named for the municipality of Mogán on Gran Canaria.[3] Physically, it has a hardness of about 6, a dull luster and appears as a transparent gray in color.


  1. ^ Mineralienatlas
  2. ^ a b c Ralph, Jolyon, and Ida Ralph. "Moganite: Moganite Mineral Information and Data." MinDat. 2007. Aug. 2007 <>.
  3. ^ a b c Webmineral data
  4. ^ Origlieri, Marcus. "Moganite: a New Mineral -- Not!" Lithosphere (1994). Aug. 2007 <>.
  5. ^ Nickel, Ernest H., and Monte C. Nichols. "IMA/CNMNC List of Mineral Names." Materials Data. June 2007. Aug. 2007 Archived May 30, 2008, at the Wayback Machine
  6. ^ Heaney, Peter J., and Jeffrey E. Post. "The Widespread Distribution of a Novel Silica Polymorph in Microcrystalline Quartz Varieties." Science ns 255 (1992): 441-443. JSTOR. Aug. 2007. Keyword: moganite.

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