Atlas Of Metamorphic Rocks And Their Textures Pdf

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Atlas of metamorphic rocks and their textures

Olivine: forsterite Olivine: Forsterite, in marble. Plane-polarised light, width of view 2. Polars crossed, width of view 2. Zircon, with distinct core and rim zones, in aluminous granulite. Plane-polarised light, width of view 0. Polars crossed, width of view 0.

Titanite sphene , in calc-silicate marble. Plane-polarised light, width of view 1 mm. Polars crossed, width of view 1 mm. Garnet: almandine, in kyanite-grade mica schist. Garnet: almandine, idioblastic and poikiloblastic, in schist.

Plane-polarised light, width of view 6 mm. Garnet: almandine, with graphitic inclusion trails showing a deflection near the rim, in kyanite-garnet schist. Garnet: almandine, with rotational double-spiral inclusion trails, in schist. Garnet: almandine-pyrope, with sillimanite inclusions, in granulite-facies garnet-cordierite gneiss. Plane-polarised light, field of view 5 mm.

Garnet: almandine-pyrope-grossular, with corona texture of plagioclase and orthopyroxene, in granulite-facies metabasite. Plane-polarised light, field of view 4 mm. Garnet: almandine-pyrope-grossular isotropic mass at centre , with corona texture of plagioclase and orthopyroxene, in granulite-facies metabasite. Polars crossed, field of view 4 mm. Garnet: andradite, in marble. Plane-polarised light, field of view 3.

Vesuvianite, in calc-silicate skarn. Plane-polarised light, field of view 2. Polars crossed, field of view 2.

Sillimanite fibrolite , intergrown with biotite in schist. Polars crossed, field of view 5 mm. Sillimanite, nodules of fibrolite in schist. Sillimanite, prismatic, in aluminous granulite. Andalusite chiastolite in graphitic hornfels. Plane-polarised light, field of view 8 mm. Andalusite chiastolite with pink core zone, in graphitic hornfels. Andalusite, poikiloblastic, in schist. Ordinary light, field of view 10 mm. Kyanite, in schist, showing three different crystal orientations.

Staurolite, prism in schist. Staurolite poikiloblast, in schist. Staurolite poikiloblast showing interpenetrant twinning, in schist. Staurolite showing internal inclusion fabric, in schist. Plane-polarised light, field of view 1 mm.

Staurolite poikiloblast, in hornfels. Plane-polarised light, field of view 2 mm. Polars crossed, field of view 2 mm. Chloritoid, in schist, showing lamellar twinning and anomalous interference colours.

Sapphirine blue , with spinel, phlogopite and enstatite in Mg-Al-rich granulite. Epidote group: Clinozoisite, showing anomalous interference colours. Polars crossed, field of view 1 mm. Epidote group: Clinozoisite, poikiloblast in eclogite.

Epidote group: Clinozoisite, poikiloblast in eclogite, showing zoned birefringence core more Fe-rich. Epidote in calc-silicate marble. Epidote group: Zoisite, in high-pressure gneiss. Plane-polarised light, field of view 1.

Epidote group: Zoisite, showing anomalous blue interference colours and narrow rim of clinozoisite. Polars crossed, field of view 1. Epidote group: Piemontite, in manganiferous metachert. Lawsonite, pale brownish, with glaucophane, chlorite and white mica, in blueschist.

Cordierite, granoblastic-polygonal texture, granulite facies. Cordierite, poikiloblastic, in low-P spotted schist Buchan type. Cordierite, showing complex sector twinning, in spotted hornfels. Cordierite colourless , in aluminous hornfels. Cordierite, in aluminous hornfels. Cordierite, with sillimanite inclusions, in granulite-facies metapelitic gneiss. Osumilite double-ring silicate resembling cordierite, diagnostic of ultrahigh-T metamorphism , with feldspar and orthopyroxene.

Note yellow 'pinite' alteration. Note near-isotropic 'pinite' alteration at margins. Pyroxene: clinopyroxene green and orthopyroxene pink in granulite-facies tonalitic gneiss. Pyroxene: clinopyroxene mostly second-order colours and orthopyroxene first-order colours in granulite-facies tonalitic gneiss.

Pyroxene: diopside, in calc-silicate marble. Pyroxene: enstatite pale pinks and greens with olivine colourless, upper right and pale olive hornblende, in granulite-facies ultrabasic gneiss. Pyroxene: enstatite first-order colours with olivine high colours, upper right , in granulite-facies ultrabasic gneiss. Pyroxene: aluminous enstatite, poikiloblast in granulite-facies cordierite gneiss. Plane-polarised light, width of view 19 mm.

Pyroxene: jadeite altered at rim and in fractures in eclogite-facies meta-granite. Pyroxene: omphacite, with symplectitic reaction rim, in eclogite. Pyroxene: omphacite, aggregate of crystals, with garnet, white mica and glaucophane in eclogite. Wollastonite, showing three cleavages on basal section.

Wollastonite, showing three cleavages and high birefringence on basal section. Amphibole: tremolite in marble. Amphibole: actinolite pale green as core of composite crystal surrounded by triple-chain silicate, in ultrabasic gneiss. Amphibole: actinolite magenta interference colour as core of composite crystal surrounded by triple-chain silicate blue , in ultrabasic gneiss.

Amphibole: blue-green hornblende, in various orientations showing different pleochroism colours, in garnet-grade metagabbro. Amphibole: blue-green hornblende, in garnet-grade metagabbro.

Note low-order interference colours, partly masked by body colour. Amphibole: hornblende, in foliated amphibolite. Amphibole: hornblende, in amphibolite derived from gabbro.

Amphibole: brown hornblende in high-temperature amphibolite. Note greenish rims resulting from retrograde change. Amphibole: anthophyllite, in contact-metamorphosed rock. Amphibole: gedrite Na-Al anthophyllite , in cordierite-gedrite gneiss.

Plane-polarised light, field of view 6 mm. Polars crossed, field of view 6 mm. Amphibole: glaucophane, in blueschist. Plane-polarised light, prisms parallel to polariser. Plane-polarised light, prisms normal to polariser. Muscovite colourless , with biotite, garnet and kyanite in schist. Muscovite bright colours , with biotite, garnet and kyanite in schist. Muscovite randomly-oriented crystals in aluminous granofels. Muscovite var.

Central grain will give a uniaxial figure 3T polytype.

Atlas of Metamorphic Rocks and Their Textures_Yardley

Olivine: forsterite Olivine: Forsterite, in marble. Plane-polarised light, width of view 2. Polars crossed, width of view 2. Zircon, with distinct core and rim zones, in aluminous granulite. Plane-polarised light, width of view 0. Polars crossed, width of view 0. Titanite sphene , in calc-silicate marble.


ATLAS OF METAMORPHIC ROCKS AND THEIR TEXTURES. B.W.D. Yardley. Reviewed by, Aral I. Okay Previous FigureNext Figure. Caption. Download PDF.


Atlas of Metamorphic Rocks and Their Textures_Yardley

Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism , which means "change in form". The protolith may be a sedimentary , igneous , or existing metamorphic rock. They may be formed simply by being deep beneath the Earth's surface, subjected to high temperatures and the great pressure of the rock layers above it.

Archaeological Ceramic Materials pp Cite as. In order to understand the origin of the components or the materials which make up pottery, it is useful to make a slight excursion into chemistry and geology. Chemistry is important because it is a major tool in understanding and interpreting the inner characteristics of ceramic materials.

Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism , which means "change in form". The protolith may be a sedimentary , igneous , or existing metamorphic rock. They may be formed simply by being deep beneath the Earth's surface, subjected to high temperatures and the great pressure of the rock layers above it.

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Metamorphic texture is the description of the shape and orientation of mineral grains in a metamorphic rock. Metamorphic rock textures are foliated, non-foliated, or lineated are described below. Foliation is a term used that describes minerals lined up in planes.

By: Published on: Dec 15, Categories: Uncategorized 0 comments. Notes Sedimentary Rocks. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Vein and extrusive rocks are characterized by a porphyritic texture, which is brought about by the rapid crystallization of the magma related to cooling and a loss of volatile components.

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