Aesthetic group of topaz crystals aesthetically disposed on a rhyolite matrix. Some of them isolated and very rich in faces. They show very well defined faces and edges, with an excellent transparency and a uniform tone. From a classic locality.

Topaz crystal aesthetically disposed on a rhyolite matrix. It shows several faces very well defined, with an excellent transparency and a uniform tone. From a classic locality.

Groups of topaz crystals aesthetically disposed on a rhyolite matrix. Some of them isolated and very rich in faces. They show very well defined faces and edges, with an excellent transparency and a uniform tone. From a classic locality.

A brilliant and very sharp bixbyite crystal. A manganese oxyde well-known and appreciated by collector for its rich crystallographic forms. In this specimen we can see the cubic main form with vertex truncated by trapezohedron and a small triangular octahedron face. A crystallographic pleasure... Very aesthetically disposed on a volcanic rocky matrix. With an old display label.