prehnite, sterling silver, fine silver
The soft pale green color of prehnite comes from a combination of aluminum and calcium as it builds up in the nooks and crannies of certain volcanic rock. It was first discovered in South Africa by a Dutch colonist, Colonel Hendrik von Prehn, from whom the mineral gets its name.
Silver, oh silver. This lustrous white metal is amazing - more reflective than gold, more conductive than copper and just plain gorgeous. When used for jewelry, silver is mixed with copper or zinc to provide more durability and reduce tarnishing. Fine silver is 99.9% silver while sterling silver is 92.5%. Other alloys are used for specific processes, such as reticulation (80% silver). All silver will tarnish over time, but can be easily cleaned and polished.