Dioptase with Calcite Gemstone Carvings The very first stone tools

The very first stone tools were not created by humans

it may very well have been that Neanderthal and Modern Man could have seen each other's camp fires between the Straight of Gibraltar

commonly schist

Each strand measures 15 inches in length

the distinctive pattern of the six-sided coral fossil emerges

Dioptase with Calcite Gemstone Carvings The very first stone toolsDioptase crystals are emerald green and translucent. The mineral got its name from the Greek words for "to see" and "through" because of the ability to see internal cleavage planes of the small crystals. The mineral forms in rhombohedral crystals (usually less than 1cm in size) with a chemical composition of CuSiO3 (H2O).