Tetragonal
Three axes at right angles, one differs in length.
7 minerals in collection

Minerals of the Tetragonal system

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Clear apophyllite crystals with pyramidal terminations from India.
Apophyllite & Stilbite
Pale green muscovite on black cassiterite crystal from China with reflection.
Cassiterite & Muscovite
Black metallic hausmannite crystal cluster with a reflection on black.
Hausmannite on Manganite & Calcite
Orange brown gem scapolite crystal from Tanzania with mirror reflection.
Scapolite
Metallic stannite and arsenopyrite on quartz with a mirror reflection.
Stannite Arsenopyrite and Quartz
Green vesuvianite crystal cluster from Canada with a mirror reflection.
Vesuvianite
Orange tabular wulfenite crystals on hematite displaying full mirror reflection.
Wulfenite Pseudocubic, Mimetite & Calcite