Perite is a mineral that has a general chemical formula of PbBiO2Cl. The name is given for Per Adolf Geijer, a Swedish economic geologist with the Geological Survey of Sweden, who discovered the mineral in 1960 outside of Langban, Sweden. Perite is orthorhombic, which means crystallographically, it contains three axes of two of equal length (the b... Found on http://en.wikipedia.org/wiki/Perite