Transcript PPrnd2

CRYSTALLOGRAPHY
TRIVIA
ROUND 2!
Round 2 – Question 1
Excluding AB,
crystal faces will
most likely occur
along which
lattice plane?
Round 2 – Question 2
What does Steno’s Law of Interfacial
Angles state?
Round 2 – Question 3
What does the crystal
growth illustration to the
left indicate?
a) lattice plane a has a
higher atomic density
than o,
b) Lattice plane o has a
higher growth rate than
a, or
c) 111 faces are only
common in large, mature
crystals
Round 2 – Question 4
The crystallographic axes shown below
are indicative of what crystal system?
Round 2 – Question 5
How are crystallographic axes
different between the orthorhombic
and tetragonal systems?
Round 2 – Question 6
What crystal face
would qualify as the
“unit face” in this
orthorhombic
crystal? (give face
intercepts)
Round 2 – Question 7
What is the
Miller Index
for the upper
face?
Round 2 – Question 8
What is the Miller
index of the shaded
face in this
hexagonal crystal?
Round 2 – Question 9
Faces b, m, and
a belong to
what zone?
[_ _ _]
Round 2 – Question 10
What is the form
index of the p
face?
{_ _ _}
End of Round 2
Pass your answers to the team on your
right for grading.
Round 2 – Question 1
Excluding AB,
crystal faces will
most likely occur
along which
lattice plane?
AC
Round 2 – Question 2
What does Steno’s Law of Interfacial
Angles state?
For a particular mineral, the angle
between adjacent faces will be constant
regardless of crystal shape or size.
Round 2 – Question 3
What does the crystal
growth illustration to the
left indicate?
a) lattice plane a has a
higher atomic density
than o,
b) Lattice plane o has a
higher growth rate than
a, or
c) 111 faces are only
common in large, mature
crystals
Round 2 – Question 4
The crystallographic axes shown below
are indicative of what crystal system?
Hexagonal
Round 2 – Question 5
How are crystallographic axes
different between the orthorhombic
and tetragonal systems?
The a and b axes in the tetragonal
system are the same length, but are
different in orthorhombic crystals.
Round 2 – Question 6
What crystal face
would qualify as the
“unit face” in this
orthorhombic
crystal? (give face
intercepts)
1a: 1b: 1c
Round 2 – Question 7
What is the
Miller Index
for the upper
face?
(113)
Round 2 – Question 8
What is the Miller
index of the shaded
face in this
hexagonal crystal?
(1120)
Round 2 – Question 9
Faces b, m, and
a belong to
what zone?
[001]
Round 2 – Question 10
What is the form
index of the p
face?
{111}