EXERCISE 6.8 Identifying Cements Name: Course: Section Date: How can you tell wh

Question

EXERCISE 6.8 Identifying Cements Name: Course: Section Date: 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 acid, color). With this in mind, answer the following questions concerning sandstone, a type of sedimentary rock consisting of cemented-together grains of quartz sand. (a) The cement (but not the grains) in a sedimentary rock 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 same hardness as the grains. The cement consists of 153 6.5 INTERPRETING CLASTIC SEDIMENTARY TEXTURES

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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