|
gptkbp:instanceOf
|
gptkb:chemical_compound
granite
|
|
gptkbp:alsoKnownAs
|
gptkb:Silicon_dioxide
|
|
gptkbp:appearance
|
White powder or colorless crystals
|
|
gptkbp:bandGap
|
8.9 eV (amorphous)
|
|
gptkbp:boilingPoint
|
2230 °C
|
|
gptkbp:CASNumber
|
7631-86-9
|
|
gptkbp:category
|
Oxide mineral
Food additive
Industrial mineral
Abrasive material
Desiccant
Glass former
Silicon compound
|
|
gptkbp:chemicalFormula
|
SiO2
|
|
gptkbp:component
|
gptkb:glass
Ceramics
Sand
Concrete
Silica gel
|
|
gptkbp:crystalSystem
|
Amorphous (fused silica)
Hexagonal (quartz)
|
|
gptkbp:density
|
2.65 g/cm³
|
|
gptkbp:discoveredBy
|
Known since antiquity
|
|
gptkbp:EC_number
|
231-545-4
|
|
gptkbp:foundIn
|
Earth's crust
|
|
gptkbp:hardnessMohs
|
7 (quartz)
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Silica
|
|
gptkbp:IUPACName
|
gptkb:Silicon_dioxide
|
|
gptkbp:meltingPoint
|
1713 °C
|
|
gptkbp:molecularWeight
|
60.08 g/mol
|
|
gptkbp:naturalOccurrence
|
gptkb:Chalcedony
gptkb:Quartz
gptkb:jewelry
gptkb:Tridymite
Cristobalite
|
|
gptkbp:refractiveIndex
|
1.458 (fused silica)
|
|
gptkbp:solubility
|
Insoluble
|
|
gptkbp:thermalConductivity
|
1.4 W/(m·K) (quartz)
|
|
gptkbp:thermalExpansion
|
0.5 × 10⁻⁶/K (fused silica)
|
|
gptkbp:toxicity
|
Inhalation of fine particles can cause silicosis
|
|
gptkbp:usedFor
|
Electronics
Construction material
Food additive
Water filtration
Abrasives
Desiccant
Manufacture of glass
|
|
gptkbp:bfsParent
|
gptkb:Diatoms
|
|
gptkbp:bfsLayer
|
5
|