Tutorial 2Sedimentary Rocks

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Lesson Plan

Rocks and Minerals Rock types & Properties Sedimentary Rock Properties

Exercise Assessment

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Objective

To be able to distinguish different types of rocks and minerals

To be able to identify clastic from non-clastic rocks To be able to assess porosity from hand specimens

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Rocks & Minerals Rocks are composed of one or more minerals. The colour of the rock is

influenced by the minerals it contains. Minerals are naturally occurring material with a definitive chemical

composition

NaAlSi3O8 – CaAl2Si2O8

KAlSi3O8

SiO2

K(Mg,Fe)3(AlSi3O10)(F,OH)2

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Rocks & Minerals Hardness: Mohs scale

Glass has a hardness of 5.5 If a mineral scratches glass

then its hardness is greater than 5.5.

If glass scratches it, its hardness is less than 5.5.

Other properties of Minerals Parting/Cleavage Fracture Streak Crystal Habit Density Magnetic

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Rocks Types

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Rocks Types

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Sedimentary Rocks

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Sedimentary Rocks

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SILICICLASTIC ROCKS

Conglomerate/Breccia Sandstone Siltstone Mudstone/Clay

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NON-CLASTIC ROCKS

Bioclastic Limestone

Coal

Chalk

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Sedimentary Rock Properties

Texture & Fabric Grain size (pebbles, sand, silt, fine grained) Sphericity & Roundness

Composition Colour Minerals (Siliciclastic or chemical)

Sedimentary structures Bedding Fossil content

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Sedimentary Rock Properties

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Exercise

Organize into groups Each group shall be presented with some rock samples Separate the rocks into 2 groups

Sedimentary Non-sedimentary (Igneous/Metamorphic)

Enumerate the properties of the sedimentary rocks in the provided identification form

Use the Sedimentary Rock identification workflow to name the rock (Please bring a printout of the workflow to class)

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Assessment

Individual Assessment Each shall be provided with 3 sedimentary rocks Tasks

List the physical properties in the provided answer sheet. Estimate the porosity (apply drops of water to check if it is being

absorbed by the sample) Using the Sedimentary Rock Identification Workflow, name the

rock