CIPW Method and Mineral Classification

The video tutorial introduces the CIPW method, a technique for converting the chemical composition of igneous rocks into their ideal mineral composition. It explains the classification process based on salic and femic ratios and outlines the steps for mineral formation. The tutorial also covers handling silica deficiency and provides rules for converting weight percentages to molecular proportions.

What is the primary purpose of the CIPW method in petrology?

• To measure the density of rocks

• To analyze the color of rocks

• To convert chemical composition to mineral composition

• To determine the age of rocks

In the CIPW classification, what is the first stage of classification?

• Sub-range

• Order

• Class

• Range

If the salic by femic ratio is greater than 7, in which class does the rock fall?

• Class 3

• Class 4

• Class 2

• Class 1

What is the first step in the CIPW calculation process?

• Formation of apatite

• Conversion of weight percentage to molecular proportion

• Formation of chromite

• Classification of rocks

Which mineral is formed if P2O5 is present in the table?

• Illuminite

• Zircon

• Chromite

• Apatite

What happens if the rock is silica deficient during the CIPW calculation?

• The rock is discarded

• The calculation is stopped

• Provisional minerals are converted to satisfy deficiency

• The rock is classified as acidic

Which mineral is formed when both Na2O and Fe2O3 are present?

• Illuminite

• Acmite

• Zircon

• Calcite

What is the significance of a hyphen in the formula during CIPW calculation?

• Indicates a silica-rich rock

• Indicates a completed calculation

• Indicates a provisional mineral

• Indicates a permanent mineral

What is the final step in the CIPW calculation process?

• Formation of calcite

• Formation of leucide

• Formation of magnetite

• Norm calculation completion

What is the result of multiplying the molecular weight by the result in the norm calculation?

• Volume of the mineral

• Weight proportion of the mineral

• Color of the mineral

• Density of the mineral