4. Identifying Cements (Ex. 6.8) How can you tell what minerals occur in a cemen

Question

4. Identifying Cements (Ex. 6.8) How can you tell what minerals occur in a cement? Simply remember the basic physical properties of the minerals (e.g., hardness, the ability to react with colour). With this in mind answer the following questions concerning sandstone, a type of sedimentary rock consisting of cemented-together grains of quart sand. a) The cement (but not the grains) in a sedimentary rocks reacts when in contact with dilute HCI. The cement consists of b) The rock, overall, has a reddish color. The cement contains c) The cement is very strong and when scratched with a steel needle it has the sam hardness as the grains. The cement consistsof

Explanation / Answer

a) Cement in sedimentary rocks consists of gravel, sand, slit and clay through which the detritals are cemented together.The cement consists of calcite.

b) sandstone is an example of reddish colored sedimentary rock..The iron oxide present in the cement gives the sandstone a red color.

c)The cement consists of quartz.It is called as silica cement.The strongest and durable cement.

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