MontanaGrow products are derived entirely from amorphous volcanic tuff formed by a geological event about 30 million years ago. Containing potassium and silicon dioxide, ...

Volcanic tuff from thousands of kilometers away ended up here. Continental platforms are usually not conducive to preserving such material for millions of years because of intense geological ...

Tuff includes microscopic particles of zircon, which makes it possible to determine the absolute age of rocks. After seven years of work, the key finding was made near the Vetluga River in Northern ...

Volcanic tuff may have glittery mica along its surface, making it appear especially beautiful in sunlight. If you are unable to find a diamond during your visit, ...

The volcanic tuff and basalt contact along Profile 1 are visible in this image (Fig. 5). Resistivity data also show a crater-like anomaly between stations at 240 and 440 ft, ...