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Geological Thin Sections > Chondrite meteorite (NWA 7308) thin section in cross polarised light by Ian Butler

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About This Gigapan

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Taken by
Ian Butler Ian Butler
Explore score
1
Size
0.32 Gigapixels
Views
787
Date added
Feb 10, 2013
Date taken
Jan 01, 2013
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Description

NWA7308 is an LL3 ordinary chondrite from North West Africa, found in 2012. The gigapan comprises 113 images taken on a Nikon D60 using direct eyepiece projection from a Zeiss microscope and luminar objective. The image was put together using PTGUI.

ordinary chondrite: A major class of chondrites, distinguished by sub-solar Mg/Si and refractory/Si ratios, oxygen isotope compositions that plot above the terrestrial fractionation line, and a large volume percentage of chondrules, with only 10-15 vol% fine-grained matrix.

LL group: The low-iron, low metal (LL) chemical group of ordinary chondrites, distinguished by their low siderophile element content, fairly large chondrules (~0.9 mm), and oxygen isotope compositions that are further above the terrestrial fractionation line than those of other ordinary chondrites. .

type 3: Designates chondrites that are characterized by abundant chondrules, low degrees of aqueous alteration, and unequilibrated mineral assemblages. Many of the low-Ca pyroxene grains are monoclinic and exhibit polysynthetic twinning. The type 3 chondrites may be divided into subtypes ranging from 3.00 (least metamorphosed) to 3.9 (nearly metamorphosed to type 4 levels). If primary igneous glass occurs in the chondrules, it belongs to type 3.

(Thanks to the Meteoritical Society for the definitions)


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