With a hardness of 6

a very time consuming process

03-00028-H - 39x33 mm / 119

This impactite was formed between 385 and 900 million years ago in Precambrian time when a meteorite crashed into the earth making a ~5 kilometers wide crater locally known as the Hallingdal Impact Crater

There are several pits

Lapis Lazuli Pendant | 925 Sterling Silver H6 With a hardness of 6Lapis lazuli is a vivid blue metamorphic rock and a gemstone that has been prized for its intense color and historical significance for thousands of years. It's composed of lazurite (for the blue color), calcite, sodalite, and pyrite. It is the presence of pyrite that causes the gold colored flecks or veins in the stone. Lapis lazuli has a moderate hardness, typically ranging from 5 to 5. 5 on the Mohs scale. High quality lapis lazuli has been