Crystal faces develop along specific planes within the crystal's internal structure. The relative abundance of a particular face is determined by the arrangement and density of atoms or molecules on that crystallographic plane.
The relative abundance of a specific crystal face is directly related to the underlying atomic structure. Different faces represent different planes, and the number of atoms occupying these planes influences their development.
Therefore, the number of atoms in the lattice structure is the primary factor governing the relative abundance of a particular face.
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Gypsum has lower density than anhydrite.
Reason (R) : Hydrated minerals tend to expand many times the original volume of the anhydrous minerals.
In the light of the above statements, choose the most appropriate answer from the options given below :
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Drumlins show features opposite to those of Roches Moutonnees.
Reason (R) : The stoss side is steep and the lee side is roughened.
In the light of the above statements, choose the most appropriate answer from the options given below :
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In a hand specimen quartz can be easily distinguished from orthoclase.
Reason (R) : Orthoclase has lower refractive index than quartz.
In the light of the above statements, choose the most appropriate answer from the options given below :
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Chronostratigraphy is concerned with the mutual time relationship of strata.
Reason (R) : Formation, member and bed are units of chronostratigraphy.
In the light of the above statements, choose the most appropriate answer from the options given below :
Match List - I with List - II.
| List - I Mineral Property | List - II Type of light |
|---|---|
| A. Cleavage | I. Plane polarized |
| B. Twinkling | II. Ordinary |
| C. Twinning | III. Crossed nicols |
| D. Disperson | IV. Convergent |
Choose the correct answer from the options given below :
Match List - I with List - II.
| List - I Optical feature | List - II Optical diagram |
|---|---|
| A. Wave front (isotropic) | I. Ellipse |
| B. Wave surface (isotropic) | II. Sphere |
| C. Wave front (anisotropic) | III. ellipsoidal |
| D. Wave surface (anisotropic) | IV. circle |
Choose the correct answer from the options given below :