- The only mineral in this classification is Wulfinite. This is apart of the Tetragonal System. Crystal Snowman Pendant Instructions.
- Crystallography What is crystallography? Symmetry Reflection
- Tetragonal-pyramidal = 4. – No pyramid faces on bottom due to lack of m planes. – Wulfinite.
- External Symmetry of Crystals, 32 Crystal Classes
- Aug 12, 2010 crystal. Wulfinite is the only mineral known to crystallize in this class. External Symmetry of Crystals, 32 Crystal Classes.
- Neue Mineralfunde in den österreichischen Ostalpen, XVIII
- ein Hohlraum auf, in welchem ebenso schöne Wulfinite vorkamen.
- Classes of Crystals | eHow.com
- It does not have planes facing each other, nor does a face sit on the bottom. The only mineral in this classification is Wulfinite.
Wulfinite is described in multiple online sources, as addition to our editors' articles, see section below for printable documents, Wulfinite books and related discussion.