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Prior Knowledge and Skills.

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Primary minerals are minerals that make up more than 5 of the rock, minor minerals are between 1-5 and accessory minerals are less. Culture must be explained in detail.

1 Precise shapes (in alphabetical order, both preferred and a few non-preferred terms) 2.

Learning Objectives.

Describe the parts of a standard thin section. If you have read the history of thin section preparation (section 2. Apr 30, 2022 Describe the parts of a standard thin section.

3), you should be already familiar with most of the process.

wikipedia. Below is an introductory guide to important definitions and terminology regarding the descriptions of thin sections. orgwikiThinsection hIDSERP,5695.

Quantitative textural analysis involves measurement of a certain number of grains (commonly 100 per thin section) so that mean grain size and sorting (standard deviation) can be calculated. Describe in the correct order the steps necessary to produce a standard thin section.

A microtome (from the Greek mikros, meaning "small", and temnein, meaning "to cut") is a cutting tool used to produce extremely thin slices of material known as sections, with the process being termed microsectioning.

3 mm.

. Minerals with refractive indices close to 1.

. Thin Section UL-11 Rock Name Olivine gabbro Hand Specimen Description Medium-grained (phaneritic) dark rock largely composed of plagioclase ferromagnesian silicate minerals.

The existence of microporosity is suggested by the presence of detrital or authigenic clays in sandstones.
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. Troubleshoot issues with using a petrographic microscope. 2 Describing shape.

3 mm. 1. Describe the parts of a thin section and how thin sections are made. Obtain and identify optical interference figures. The thin slice of rock can be topped with a thin cover glass to enhance the optical qualities of the thin section. Obtain and identify optical interference figures.

Choose a thin section to display and click on the controls to change the view.

1. Each description contains a list of the primary, minor and accessory minerals in each rock.

2 Describing shape.

) Clastic sedimentary rocks in which a significant proportion of the clasts are larger than 2 mm are known as conglomerate if the clasts are well rounded, and breccia if they are angular.

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Describe the parts of a thin section and how thin sections are made.