Clinopyroxene - XYZ2O6

Optical properties:

• Colour and Pleochroism: Usually colourless, gray, pale green or pale brown, darker colours associated with Fe-rich varieties titanaugite is more distinctly coloured from brown/pink to violet.
• Form: Form stubby prisms elongate along the c-axis, basal sections are 4 or 8 sided and show two cleavages at 90.°
• Cleavage: Parallel to {110}, which intersect at 90°.
• Twinning: Simple and lamellar twins and composition planes, which in combination may form a herringbone pattern.
• Alteration: Commonly alter to uralite (a light coloured amphibole), or may alter to serpentine, chlorite, biotite, carbonates and /or other silicates.
• Relief: High positive.
• Distinguishing Features: Inclined extinction, higher birefringence, 2nd order interference colours, low 2V, optically positive in comparison with opx.

For structural characteristics and for the classification of the Pyroxene group of minerals see the page structural characteristics and classification

Bibliography



• Deer, W.A., Howie, R.A., Zussman, J. (1998) Rock-forming Minerals.
• Optical Mineralogy : The Nonopaque Minerals by Phillips / Griffen
• Ron H. Vernon (2004): A pratical guide to rock microstructure. Cambridge editore
• David Shelley (1983): Igneous and metamorphic rocks under the microscope. Campman & Hall editori




Photo
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Aegirine. PPL image, 2x (Field of view = 7mm)
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Aegirine. XPL image, 2x (Field of view = 7mm)
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Aegirine. PPL image, 2x (Field of view = 7mm)
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Aegirine. PPL image, 2x (Field of view = 7mm)
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Aegirine. PPL image, 2x (Field of view = 7mm)
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Aegirine. XPL image, 2x (Field of view = 7mm)
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Leucite (clorless) and Clinopyroxene crystals. PPL image, 2x (Field of view = 7mm)
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Leucite and Clinopyroxene crystals. XPL image, 10x (Field of view = 2mm)
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Leucite (clorless) and Clinopyroxene crystals. PPL image, 2x (Field of view = 7mm)
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Pyroxene with exolution lamellae in a Gabbronorite, Zimbawe. XPL image, 10x (Field of view = 2mm)/td>
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Pyroxene with exolution lamellae in a Gabbronorite, Zimbawe. XPL image, 10x (Field of view = 2mm)/td>>
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Pyroxene with exolution lamellae in a Gabbronorite, Zimbawe. XPL image, 10x (Field of view = 2mm)/td>
neroassoluto(20).jpg

Pyroxene with exolution lamellae in a Gabbronorite, Zimbawe. XPL image, 10x (Field of view = 2mm)/td>
neroassoluto(21).jpg

Pyroxene with exolution lamellae in a Gabbronorite, Zimbawe. XPL image, 10x (Field of view = 2mm)/td>
neroassoluto(22).jpg

Pyroxene with exolution lamellae in a Gabbronorite, Zimbawe. XPL image, 10x (Field of view = 2mm)/td>
neroassoluto(24).jpg

Pyroxene with exolution lamellae in a Gabbronorite, Zimbawe. XPL image, 10x (Field of view = 2mm)/td>
neroassoluto(26).jpg

Pyroxene with exolution lamellae in a Gabbronorite, Zimbawe. XPL image, 10x (Field of view = 2mm)/td>
neroassoluto(27).jpg

Pyroxene with exolution lamellae in a Gabbronorite, Zimbawe. XPL image, 10x (Field of view = 2mm)/td>
nefelinolite(3).jpg

Augite (pink), Nepheline (colorless) and Apatite (elongated, colorless crystals). PPL image, 2x (Field of view = 7mm)
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Augite and Nepheline (I order gray). XPL image, 2x (Field of view = 7mm)
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Augite (pink) and Nepheline (colorless). PPL image, 2x (Field of view = 7mm)
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Augite and Nepheline (I order gray). XPL image, 2x (Field of view = 7mm)
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Augite (pink) and Nepheline (colorless). PPL image, 2x (Field of view = 7mm)
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Augite (pink) and Nepheline (colorless). PPL image, 2x (Field of view = 7mm)
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Coarse-grained Augite crystals and sericitized plagioclase. PPL image, 2x (Field of view = 7mm)/td>
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Coarse-grained Augite crystals and plagioclase. XPL image, 2x (Field of view = 7mm)/td>
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Coarse-grained Augite crystals and sericitized plagioclase. PPL image, 2x (Field of view = 7mm)/td>
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Coarse-grained Augite crystals and sericitized plagioclase. PPL image, 2x (Field of view = 7mm)/td>
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Coarse-grained Augite crystals and sericitized plagioclase. PPL image, 2x (Field of view = 7mm)/td>
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Coarse-grained Augite crystals and sericitized plagioclase. PPL image, 2x (Field of view = 7mm)/td>
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hour-glass sector zoning in a Augite crystal. PPL image, 2x (Field of view = 7mm)/td>
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hour-glass sector zoning in a Augite crystal. XPL image, 2x (Field of view = 7mm)/td>
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hour-glass sector zoning in a Augite crystal. PPL image, 2x (Field of view = 7mm)/td>
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hour-glass sector zoning in a Augite crystal. XPL image, 2x (Field of view = 7mm)/td>
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hour-glass sector zoning in a Augite crystal. XPL image, 2x (Field of view = 7mm)/td>
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hour-glass sector zoning in a Augite crystal. XPL image, 2x (Field of view = 7mm)/td>