The alpha (low) Quartz
Structure
Last modified 5 April
2001
You can now
- Prototype: alpha SiO2
- Pearson Symbol: hP9
- Space Group: P3221 (Cartesian and lattice coordinate listings
available)
- Number: 154
- Primitive Vectors:
- A1 = ½ a X - ½ 31/2
a Y
- A2 = ½ a X + ½ 31/2
a Y
- A3 = c Z
- Basis Vectors:
The Si atoms are on the (3a) sites, and the O atoms are on the
(6c) sites
- B1 = x1 A1 + 2/3
A3 = x1 a X - ½
31/2 x1 a Y + 2/3 c Z
(Si)
- B2 = x1 A2 + 1/3
A3 = x1 a X + ½
31/2 x1 a Y + 1/3 c Z
(Si)
- B3 = - x1 A1 -
x1 A2 = - x1 a X
(Si)
- B4 = x2 A1 +
y2 A2 + z2
A3 = ½ (x2+y2) a
X + ½ 31/2 (x2-y2) a
Y + z2 c Z (O)
- B5 = -y2 A1 +
(x2-y2) A2 + (2/3 +
z2) A3 = ½ (x2 - 2
y2) a X + ½ 31/2 x2 a
Y + (2/3 + z2) c Z (O)
- B6 = (y2 - x2)
A1 - x2 A2 + (1/3 +
z2) A3 = ½ (y2 - 2
x2) a X - ½ 31/2 y2 a
Y + (1/3 + z2) c Z (O)
- B7 = y2 A1 +
x2 A2 - z2
A3 = ½ (x2+y2) a
X + ½ 31/2 (y2-x2) a
Y - z2 c Z (O)
- B8 = -x2 A1 +
(y2-x2) A2 + (2/3 -
z2) A3 = ½ (y2 - 2
x2) a X + ½ 31/2 y2 a
Y + (2/3 - z2) c Z (O)
- B9 = (x2 - y2)
A1 - y2 A2 + (1/3 -
z2) A3 = ½ (x2 - 2
y2) a X - ½ 31/2 x2 a
Y + (1/3 - z2) c Z (O)
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