listorical Geology Lab Mamal tiduaehotmail.com. Priating is for personal. prival

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listorical Geology Lab Mamal tiduaehotmail.com. Priating is for personal. privale use oaly. No part of this book may be reproduced or PRINTED BY:cp paeartpax permission. Vicolators will be prosccuted EXERCISES Sedimentary Rocks Exercises PRE-LAB EXERCISES Black shale Diatomite Ooiliaie Graywacke Arkose Rock Intraclastic limestone Quartz Red sandsione Lignite 2. Theve are tree white, inc-grained sedimenmary rocks What dstiaguihing churacteristics mighi you ave to sell them apat? Chaik Kaolia , What is the main difference between shale and claystone? For each of the rock types in de talble below, give the same of the domisan ntral, the chemical formula cihat miufal, and tell whether or not the mineral for rocki will effervesce (hzz) in hydrochloric acid Rock Trpe Rock gypsum Rock salt Chert Sedimentary Rods Exercises 107

Explanation / Answer

1)Terrigenous sedimentary rocks --  Terrigenous sediments are the weathering products of rocks exposed at the Earth's surface. They are brought to the ocean by rivers, winds, and ice

Graywacke , Arkose , Quartz conglomerate, Red sandstone , Interclastic limestone

2) Distinguishing feature of these rocks are

chalk-  Chalk is made of coccolithophores, which have a calcite skeleton, so it is made of CaCO3. that is why it will effervescence when acid drop on it

kaolin- It is a clay mineral with a luster of Pearly to dull earthy.( Formed of kaolinite mineral)

diatomite -Diatomite is made from diatoms, which have a silica skeleton, so it is mostly made up of SiO2. This wont give effervescence

3) The general term mudrock can be applied to any indurated sediment made up of silt and/or clay.If it can be determined that most of the particles (over two-thirds) are clay-sized the rock may then be called a claystone

The term shale is sometimes applied to any mudrock but it is best to use this term only for mudrocks that show a fissility, which is a strong tendency to break in one direction, parallel to the bedding  

SO The main difference between claystone and shale is the fissility character which is in shale.

4) Rock type Mineral name chemical formula reaction to Hcl

limestone Calcite CaCo3 Gives effevescence

dolostone dolomite CaMg(CO) gives fizzy effervescence

Rock gypsum Gypsum CaSO4·2H2O no reactiion

Rock salt halite NaCl No effervescence

chert quartz SiO2 no effervescence

Travertine calcite CaCo3 gives effervescence

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