Solid phase
Official name
Tin(IV) oxide
Secondary names
Stannic oxide; Stannic dioxide; Tin dioxide; Cassiterite
CAS number
18282-10-5
Type
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
oxide
Chemical composition
Formula
$SnO_2$
Chemical formula
SnO2
Elemental formula
Sn O2
Isotope mixture type
terrestrial abundance
6.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Sn$ Tin element 1 0.3333333333333333 1 constituent element main
$O$ Oxygen element 2 0.6666666666666666 1 constituent element main
Chemical bonds
  Bond Number
$-Sn-O-$ 6
Class
tridimensional covalent networks (11)
Type
one metal and one non-metal (or metalloid) tridimensional networks (11.04)
Equivalent mineral
Cassiterite
Phase type
crystalline
Crystal system
tetragonal
Crystal class
ditetragonal-dipyramidal
Crystal class symbol
4/m (C4h)
Crystal spacegroup
P4(2)/mnm
Molar mass
150.708 $g/mol$
Density
6.9 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid 1630°C (1900 K)
Refringence type
uniaxial
Refringence sign
positive
Birefringence
0.090 - 0.103
Refraction index $n_{\alpha}$
1.99 - 2.01
Refraction index $n_{\beta}$
2.093 - 2.100
Pure color
gray
Diaphaneity
transparent
Luster
adamantine
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