Thin Section of Minerals

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در اين تاپيك به بررسي خواص ميكروسكوپي كاني ها و سنگ ها مي پردازيم .
اميدوارم همراهي كنيد و خوشتون هم بياد .
اينجا عكس مي گذاريم بعد در مورد بافت و خواصش صحبت مي كنيم

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كسي درباره بافت ميرمكيت اطلاعات داره ؟؟

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Amphibolite - Cross polarized light - Godin Tepe - Iran

Amphibole Group

Sharred Properties:
Crystal system: Monoclinic
Twinning: simple, lamellar, common
Cleavage: two good at about 60 or 120o
Relief: moderate, moderate to high
Occurrence: metamorphic rocks


It is often more convenient in pottery thin-sections to group the amphibole group together. They can be identified collectively by the distinct cleavages and it is probably preferable in most cases to simply say whether the inclusion is pleochroic, and if so what is the nature of the pleochroism, or that it is not pleochroic at all. This is preferable to unreliable identifications, the most common being identifying a red pleochroic amphibole as the relatively rare oxyhornblende, when it is more likely to be an ordinary green-pleochric amphibole which has been altered in the firing.

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Plagioclase - Cross polarised light - Faza petrofabric, Yemen - field of view 0.5mm

Plagioclase - same as above - rotated to display areas of extinction


Plagioclase

Na[AlSi3O8] - Ca[Al2Si2O8]2

Crystal system: Triclinic
Refractive index: 1.527-1.590
Birefringence: 0.10-0.13
Cleavage: 1 perfect, 1 good intersecting at angle
Twinning: lamellar twinning
Colour in PPL: colourless
Pleochroism: -
Relief: low
Distinction: lamellar twinning distinctive, untwinned plagioclase is practically impossible to distinguish from untwinned potassic feldspars
Occurrence: most abundant mineral in basic and intermediate igneous rocks, widespread in metamorphic rocks

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كسي واقعا عكس نداره بگذاره ؟
لاقل سئوال بپرسيد

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Serpentine

Mg3[Si2O5](OH)4

Crystal system: Monoclinic
Refractive index: 1.532-1.574
Birefringence: 0.004-0.007 (antigorite), 0.006-0.008 (lizardite), 0.013-0.017 (chrysotile)
Cleavage: chrysotile fibrous, others one perfect
Twinning: occasional
Colour in PPL: colourless to pale green, often oxidizes to red in pottery
Pleochroism:
Relief: low
Distinction: lower birrefringence than micas, chlorite higher RI
Occurrence: altered ultrabasic rocks, especially from ophiolites



Serpentine - Plain polarised light - Tell Hadidi - Syria

Serpentine - Plain polarised light - Tell Hadidi - Syria

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