Category Archives: rocks

Migmatite : A Mixed Rock

  Migmatite is a rock that is a mixture of metamorphic rock and igneous rock. It is created when a metamorphic rock such as gneiss partially melts, and then that melt recrystallizes into an igneous rock, creating a mixture of the unmelted metamorphic part with the recrystallized igneous … Continue reading

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Silt: Environmental Impact

Silt is granular material of a size  between sand and clay.Silt particles range between 0.0039 and 0.0625 mm, larger than clay but smaller than sand particles. ISO 14688 grades silts between 0.002 mm and 0.063 mm.The origin trace back to whose is quartz and feldspar. … Continue reading

Posted in Environment, rocks, Soils, Urban Studies | 5 Comments

Earthquakes Deposit Gold in Fault Zones by Flash Evaporation

Gold deposits may be created in a flash. Along fault zones deep within Earth’s crust, small cavities filled with fluids rich in dissolved substances such as gold and silicate minerals can grow suddenly to as much as 130,000 times their … Continue reading

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Montmorillonite Clay

Montmorillonite is a very soft phyllosilicate group of minerals that typically form in microscopic crystals, forming a clay. It is named after Montmorillon in France. Montmorillonite, a member of the smectite family, is a 2:1 clay, meaning that it has … Continue reading

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