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Quartz: synthesis at Earth-surface conditions.
Researchers synthesized quartz directly from seawater at room temperature, a novel achievement. This finding supports theories of quartz precipitation during natural geological processes like weathering.
Area of Science:
- Geochemistry
- Mineralogy
- Materials Science
Background:
- Quartz is a common mineral, but its direct synthesis from aqueous solutions at ambient conditions is challenging.
- Previous synthesis methods often required amorphous silica precursors and aging steps.
Purpose of the Study:
- To synthesize crystalline quartz directly from seawater at room temperature.
- To determine the solubility of silica in equilibrium with quartz under earth-surface conditions.
Main Methods:
- Crystallization of quartz directly from natural seawater.
- Measurement of dissolved silica concentration at equilibrium.
Main Results:
- Identifiable quartz was successfully synthesized from seawater at 20°C and 1 atm.
- The equilibrium concentration of dissolved silica was determined to be 4.4±0.3 ppm.
- This value aligns with theoretical predictions based on higher temperature data.
Conclusions:
- Direct quartz crystallization from aqueous solutions at earth-surface conditions is feasible.
- This process occurs without the need for amorphous silica intermediates.
- The findings support the geological hypothesis of direct quartz precipitation during chemical weathering and diagenesis.
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