David K. Joyce

Calcite, Quartz

5.6x4.3x2.6 cm
Snake Butte

South Dakota, USA

Calcite, QuartzCalcite, Quartz

Item number: 22153

Here is an interesting crystallization phenomenon! At Snake Butte, water enriched with calcium carbonate, percolates through silica sand and crystalizes out as scalenohedral calcite crystals. Interestingly, though, the calcite crystals enclose sand. These odd crystals, although are crystallized as calcite crystals, incorporate 80% or so sand by volume! Paradoxically, they are the shape of calcite crystals but appear to be made of sand! Looks great!