Crystal System Classes: Identifying Differences
Understanding the number of crystal classes associated with each crystal system is essential for solving this problem.
Crystal System Class Counts
The number of distinct crystal classes (point groups) for the relevant crystal systems are:
| Crystal System | Number of Classes |
| Cubic | 3 |
| Tetragonal | 7 |
| Orthorhombic | 3 |
| Monoclinic | 3 |
| Hexagonal | 7 |
| Triclinic | 1 |
Comparing Class Numbers by Option
We analyze each given pair:
- Option 1: Cubic (3 classes) compared to Tetragonal (7 classes). These counts are different.
- Option 2: Monoclinic (3 classes) compared to Orthorhombic (3 classes). These counts are the same.
- Option 3: Tetragonal (7 classes) compared to Hexagonal (7 classes). These counts are the same.
- Option 4: Monoclinic (3 classes) compared to Triclinic (1 class). These counts are different.
Conclusion
The question asks to identify the pair of crystal systems that do not share the same number of classes. Both Option 1 (Cubic-Tetragonal) and Option 4 (Monoclinic-Triclinic) feature systems with differing class counts. Specifically, the Monoclinic system has 3 classes, while the Triclinic system has only 1 class. This difference makes the pair Monoclinic - Triclinic the correct choice.
Similar Questions
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 PropertyList - II
Type of lightA. 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 featureList - II
Optical diagramA. 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 :
- A solid crystal in which a face on one side is opposite to a point on the other, is called :
- The relative abundance of a particular face of a crystal is a function of :
- In case of dipping beds, progressively younger beds occur along the directions of dip if :
- On level surface, elliptical outcrops are commonly exhibited by :
Important Questions from Mixed Topic (CUET PG)
- Kalpsutra, the illustrated canonical text is from:-
- The Harappan city almost exclusively devoted to craft production was-:
- Mohandas Karamchand Gandhi launched quit India movement after the failure of:-
- The "Objectives Resolution" was introduced in constituent assembly by:-
- Who among the following was not a member of the constituent assembly:-
