MINERALOGY BASIC CONCEPTS (BRAVAIS LATTICE)

Question 1

This contains lattice nodes only at the corners

Answer 1

Primitive (P)

Question 2

Contains lattice nodes at the corners and at the center

Answer 2

Body-centered (I)

Question 3

Contains an additional lattice at the center of 2 opposite sides

Answer 3

Base-Centered (C)

Question 4

Contains additional lattice at the center of ech face

Answer 4

Face-Centered (F)

Question 5

Differentiate plane lattice from space lattice

Answer 5

Plane lattice is repeating pattern in 2 directions while Space lattice is translation in 3 direction

Question 6

How are bravais lattice distinguished?

Answer 6

1) Unit translation vectors
2) Angle between vectors
3) Whether they are primitive or others

Question 7

How do bravais lattice form?

Answer 7

When each of the five plane lattice are reapeated in three directions

Question 8

what are the five plane lattice groups?

Answer 8

1)Square
2) Rectangle
3)Centered Rectangle
4)Hexagonal
5) Oblique

Question 9

Bravais Lattice for Triclinic

Answer 9

P

Question 10

Bravais Lattice for Monoclini

Answer 10

P C

Question 11

Bravais Lattice for Orthorhombic

Answer 11

P I C F

Question 12

Bravais Lattice for Tetragonal

Answer 12

P I

Question 13

Bravais Lattice for Hexagonal

Answer 13

P , Rhombohedral

Question 14

Bravais Lattice for Cubic

Answer 14

P, I, F

Question 15

Produced by translating an oblique plane lattice at distance c not at right angles to either a or b. The unit cell dimensions are of different length

Answer 15

S Triclinic

Question 16

Produced by translating a primitive rectangular plane lattice at a distance equal to c, so that angle B >90 and angle A=90

Answer 16

P Monoclinic

Question 17

Produced by translating a centered rectangular plane lattice at a distance c so that angle B >90 and A=90

Answer 17

C Monoclinic

Question 18

Produced by vertical translation of a primitive rectangular lattice at distance equal to C and angles A and B = 90

Answer 18

P Orthorhombic

Question 19

Produced by translating a primitive rectangular lattice at a distance equal to 0.5c vertical, 0.5b right, 0.5a back. Every second lattice plane is alligned vertically at distance c.

Answer 19

I Orthorhombic

Question 20

Produced by translating vertically at distance c a centered rectangular plane lattice and angles A and B=90, has nodes in the center of the top and bottom faces

Answer 20

C Orthorhombic

Question 21

Produced by translating a centered rectangular plane lattice a distance equal to 0.5c up, 0.5b right and 0.5a back. Alternate place lattices are aligned vertically at distance c

Answer 21

F Orthorhombic

Question 22

Produced by vertical translation of a hexagonal plane lattice at a distance equal to c. The unit cell has a rhomb-shape cross section with internal angle of 60deg and 120 deg

Answer 22

P Hexagonal

Question 23

produced by translating hexagonal plane lattice on a diagonal distance equal to 1/3 up and 2/3a cos 30 back, at right angles to the b axes

Answer 23

P Rhombohedral or P Trigonal

Question 24

Produced by translating a square plane lattice at distance c which is not equal to the distance of a=b

Answer 24

P Tetragonal

Question 25

Produced by translating a square plane lattice at distance equal to 0.5c up, 0.5b right and 0.5 back in which c is not equal to a and b. Alternating place lattice are algined vertically at distance c

Answer 25

I Tetragonal

Question 26

produced by translating the square plane lattice distance a perpendicular to the plane latice

Answer 26

P Cubic

Question 27

Produced by translating the square plane lattice along a diagonal a distance equal to 0.5a to the right, 0.5a to the back, and 0.5a up. Alternate plane lattices are aligne vertically at distance a

Answer 27

I Cubic

Question 28

Produced by translating a square plane lattice whose unit mesh dimension is x, a distance equal to 0.5x to the right, 0.5x to the rear, and x/square root of 2 vertically. The length of the unit cell is a=b=c square root of 2x

Answer 28

F cubic

Question 29

Who demonstrated in a 3-dimensional system there are fourteen possible lattices

Answer 29

Auguste Bravais, 1848

Question 30

an infinite array of discrete points with identical environment

Answer 30

Bravais Lattice