Dioptase with Calcite Gemstone Carvings spindle-shaped fossils have surfaces marked

spindle-shaped fossils have surfaces marked by weak spiral lines in a helix

commonly schist

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

The very first stone tools were not created by humans

They are considered to be “living fossils” because of the great similarity between modern and fossil forms

Dioptase with Calcite Gemstone Carvings spindle-shaped fossils have surfaces markedDioptase 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).