Zircon Crystal Symmetry Explained
Zircon type crystals, exemplified by Zircon (ZrSiO4), crystallize within the tetragonal crystal system. Their characteristic symmetry is defined by specific crystallographic elements.
Key Symmetry Elements
- Mirror Planes: Zircon type crystals possess 5 mirror planes. These are symmetry planes that divide the crystal into identical halves.
- Rotational Axes: These crystals feature 5 rotational axes of symmetry. This includes one principal axis (typically the 4-fold axis) and associated secondary axes.
- Centre of Symmetry: Zircon type crystals contain a centre of symmetry. This means that for every point within the crystal, an identical point exists directly opposite it through the centre.
These properties correspond to the 4/mmm point group in the tetragonal system.
Conclusion: The correct designation for Zircon type crystals includes 5 planes, 5 axes, and a centre of symmetry.
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 :
- Which of the following pairs do not have the same number of classes in their crystal system ?
- 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 :
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:-
