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Infilling - closing the gap

Let the rocks tell their story

quartz infilling a rock cavity

Open space filling is the hallmark of epithermal vein systems.
In this specimen a cavity is filled with low temperature fluids in which quartz (silicon dioxide) is dissolved.
As the fluid cools the dissolved quartz mineral preciptates and forms crystals.
The crystals grow out at right angles from the cavity wall.
The larger the crystals, the longer the period of crystallisation.