Madupite

Madupite: Originally described as a melanocratic variety of leucitite essentially composed of diopside and phlogopite in a glassy matrix, which has the composition of nepheline and leucite. Wyomingite is a more felsic variety. Now regarded as a diopside madupitic lamproite. The name derives from the Shoshone Indian madúpa = Sweetwater. Wyoming, USA.

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Madupite outcrop. Pilot Butte volcanic center, Leucite Hills, Wyoming, USA. From James St. John.

Madupite. Pilot Butte volcanic center, Leucite Hills, Wyoming, USA. From James St. John.

Bibliography

• Carmichael I.S.E., Turner F.J. & Verghoogen J. (1974): Igneous Petrology. McGraw-Hill. • Bergman, S. C.; 1987: Lamproites and other potassium-rich igneous rocks: a review of their occurrences, mineralogy and geochemistry. In: Alkaline Igneous rocks, Fitton, J.G. and Upton, B.G.J (Eds.), Geological Society of London.
• Mitchell, R. H.; Bergman, S. C. (1991). Petrology of Lamproites.
• Woolley, A.R., Bergman, S.C., Edgar, A.D, Le Bas, M.J., Mitchell, R.H., Rock, N.M.S. & Scott Smith, B.H., 1996. Classification of lamprophyres, lamproites, kimberlites, and the kalsilitic, melilitic, and leucitic rocks. The Canadian Mineralogist, Vol 34.

Photo
Poikilitic phlogopite crystals, dioposide and Priderite (the small brown crystals in the groundmass) in a Madupite from Leucite hills. PPL image, 2x (Field of view = 7mm)	Poikilitic phlogopite crystals and dioposide in a Madupite from Leucite hills. XPL image, 2x (Field of view = 7mm)	Poikilitic phlogopite crystals, dioposide and Priderite (the small brown crystals in the groundmass) in a Madupite from Leucite hills. PPL image, 2x (Field of view = 7mm)
Poikilitic phlogopite crystals and dioposide in a Madupite from Leucite hills. XPL image, 2x (Field of view = 7mm)	Poikilitic phlogopite crystal, dioposide and Priderite (the small brown crystals in the groundmass) in a Madupite from Leucite hills. PPL image, 10x (Field of view = 2mm)	Poikilitic phlogopite crystal and dioposide in a Madupite from Leucite hills. XPL image, 10x (Field of view = 2mm)
Poikilitic phlogopite crystal and dioposide in a Madupite from Leucite hills. XPL image, 2x (Field of view = 7mm)	Poikilitic phlogopite crystal, dioposide and Priderite (the small brown crystals in the groundmass) in a Madupite from Leucite hills. PPL image, 10x (Field of view = 2mm)	Poikilitic phlogopite crystals and dioposide in a Madupite from Leucite hills. XPL image, 2x (Field of view = 7mm)
Poikilitic phlogopite crystal, dioposide and Priderite (the small brown crystals in the groundmass) in a Madupite from Leucite hills. XPL image, 10x (Field of view = 2mm)	Poikilitic phlogopite crystal, dioposide and Priderite (the small brown crystals in the groundmass) in a Madupite from Leucite hills. XPL image, 10x (Field of view = 2mm)	Poikilitic phlogopite crystal, dioposide and Priderite (the small brown crystals in the groundmass) in a Madupite from Leucite hills. XPL image, 10x (Field of view = 2mm)