Various rock samples containing or consisting of shungite, a rare material named for the village of Shunga in northern Lake Onega. It is amorphous, not crystalline and consists of carbon which has not converted to graphite, despite being 2 billion years old. Pyramid sample is cut into shape for decorative purposes. Preview dataset found at https://doi.org/10.23729/09e62d3f-f96f-439d-ae09-5762d3911dbd . To obtain data, please contact fairdata-pas@gtk.fi .

2021