Ageodeit is a rocky cavity, usually closed, lined with crystals (often automorphic) and other mineral matter. It is not really a mineral but a composition of magmatic, crystalline and/or sedimentary formations.
Sahara desert rose. Unique piece, only one unit available. Just like the photo. Very pretty, a gift of nature. They are created with sudden changes in temperature in the desert. Approximate weight: 25 kg....
They had a thin shell of aragonite, planispiralada and with a very marked ornamentation, consisting of well-defined ribs. Said shell is divided into two zones: the "phragmocone", which is the partitioned part of the...