Jacupirangite

A jacupirangite is an ultramafic plutonic rock that is part of the ijolite series. composed chiefly of titanaugite with minor nepheline and accessory biotite and magnetite, apatite, perovskite and melanite garnet. Jacupirangites are usually cumulate rocks formed by accumulation of pyroxene. They are essentially pyroxenites. Its name, given by Derby in 1891, is derived from Jacupiranga, Brazil.


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Campione di jacupirangite proveniente da Magnet Cove. USA. Photo by Michael P. Klimetz.




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Campione di jacupirangite proveniente da Magnet Cove. USA. Photo by Michael P. Klimetz.





Bibliography



• Eric A.K.Middlemost (1985): Magmas and Magmatic Rocks. Longman, London
• Ron H. Vernon (2004): A pratical guide to rock microstructure. Cambridge editore
• K.G.Cox, J.D.Bell & R.J Pankhurst (1979): The interpretetion of igneous rocks. George Allen&Unwin editori.
• David Shelley (1983): Igneous and metamorphic rocks under the microscope. Campman & Hall editori


Photo
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Titanoaugite, nepheline (colorless), biotite and magnetite crystals in a Jacupirangite. PPL image, 2x (Field of view = 7mm)
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Titanoaugite, nepheline (colorless), biotite and magnetite crystals in a Jacupirangite. PPL image, 2x (Field of view = 7mm)
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Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
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Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
jacupirangite(2).jpg

Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
jacupirangite(5).jpg

Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
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Titanoaugite, nepheline (colorless), biotite and magnetite crystals in a Jacupirangite. PPL image, 2x (Field of view = 7mm)
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Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
jacupirangite(8).jpg

Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
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Titanoaugite, nepheline (colorless), biotite and magnetite crystals in a Jacupirangite. PPL image, 2x (Field of view = 7mm)
jacupirangite(7).jpg

Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
jacupirangite(8).jpg

Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
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Titanoaugite, nepheline (colorless), biotite and magnetite crystals in a Jacupirangite. PPL image, 10x (Field of view = 2mm)
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Titanoaugite, nepheline (colorless), biotite and magnetite crystals in a Jacupirangite. PPL image, 10x (Field of view = 2mm)
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Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
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Titanoaugite crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
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Titanoaugite and nepheline (colorless) crystals in a Jacupirangite. PPL image, 10x (Field of view = 2mm)
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Titanoaugite and nepheline (gray) crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
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Titanoaugite and nepheline (colorless) crystals in a Jacupirangite. PPL image, 10x (Field of view = 2mm)
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Titanoaugite crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)
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Titanoaugite crystals in a Jacupirangite. XPL image, 2x (Field of view = 7mm)