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Hydrothermal growth
vgrowth(z)≈3•vgrowth(x)
righthanded α-quartz
H2O+Na2CO3
p≈700...1000bar
T≈345°C ΔT≈10°C
vgrowth(z)≈0.4mm/day
H2O+NaOH
p≈1000...1500bar
T≈380°C ΔT≈25°C
vgrowth(z)≈1mm/day