Cobblestones yog masterpieces ntawm lub ntiaj teb chemistry. LawvCov khoom tseem ceeb yog silicon dioxide (SiO₂), feem ntau suav nrog95%-96%ntawm lawv pawg. Cov kab mob xws li hlau oxide, manganese, tooj liab, txhuas, thiab magnesium ua raws li cov xim xim:
Liab hues: Hlau oxide
Blue tones: Copper compounds
Ntshav ntxoov: Manganese
Yellow translucenceTom ntej: Silica colloids (chalcedony)
Emerald ntsuab: Green mineral inclusions
Cov noCov xim ions yaj hauv silica- cov tshuaj nplua nujtsim infinite xim variations, ua rau lub pob zeb displayingdub, dawb, daj, liab, ntsuab tsaus, thiab grey -xiav palettes.
Lub cev muaj zog ua rau cobblestones tshwj xeeb engineering cov ntaub ntawv:
Nto smoothness: 98%
Compressive zog: >600 Kg/m²
Mohs hardness: 2-3 (f=10-15 coefficient)
Cov txiaj ntsig tseem ceeb: Siab-resistant, puas ntsoog- pov thawj, corrosion- siab ntev, thiab eco- phooj ywg
(Daim duab: Mineral qauv nyob rau hauv polarized microscopy)