EMT-type zeolite synthesized from obsidian

• Free-organic template synthesis of EMT-type zeolite using obsidian.
• EMT nanocrystals (200–300 nm) formed starting from 35 °C using sea water.
• Fully crystalline EMT material synthesized at 60 °C with distilled water.
• Nanosized EMT material represents useful product for industrial applications.

Organic-template-free EMT-type zeolite was synthesised at low temperatures using obsidian as a precursor material. When using sea water during the hydrothermal incubation, the data indicate that 200–300-nm nanocrystal minerals begin to form at 35 °C, whereas the temperature must be increased up to 60 °C to form well-crystallized zeolite with distilled water.

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