126 GUIDE TO THE AUSTRALIAN MUSEUM. 



other examples of crystals the visitor (especially by using the 

 Catalogue) can refer to the general collection, where well crystal- 

 lized minerals will be found. 



In the first tray (Cubic System) the following crystallized 

 minerals are represented, Diamond (a cube from Brazil), Fluor 

 Spar, Pleonaste or Black Spinel, Spinel Ruby, Garnet, Zincblende, 

 Magnetic Iron, Pyrite, Cobaltite, Galeoa, Red Oxide of Copper, 

 Argentite or Silver Glance, and Gold (an Octahedron with some 

 faces of the cube). 



In the second tray (Tetragonal System), Tin ore or Cassiterite, 

 and Zircon are represented. 



In the third tray (Hexagonal System) will be found Carbo- 

 nate of Lime or Calcite, a mineral which occurs in the greatest 

 variety of forms and combinations. Phosphate of Lime or 

 Apatite, Corundum, Quartz, Tourmaline, and Beryl, or Aqua- 

 marine are also exhibited. 



On the other side, in the fourth tray, the Rhombic System is 

 illustrated by the following crystallized minerals : — Heavy Spar, 

 also known as Sulphate of Baryta or Barytes, Celestite or sul- 

 phate of strontia, Aragonite and Calcite, both carbonates of lime. 

 Anhydrite, Olivine, Pinite, Staurolite, Topaz, Manganite, Stibnite 

 (antimony ore), Mispikel, Redruthite (copper glance), Stephanite 

 (brittle silver), &c. 



In the fifth tray the Oblique System is illustrated by Borax, 

 Gypsum, Augite, Diopside, Hornblende, Epidote, Orthoclase, 

 Felspar, Hormotome, Datolite, Titanite, and Azurite (blue 

 carbonate of copper). In the same tray the Triclinic System is 

 illustrated by Cryolite, Microcline, Albite, Oligoclase, Anorthite, 

 Labradorite, and Cyanite, 



The last tray contains a selection of large crystals by which the 

 six Crystallographic Systems are again illustrated. 



In two special cases are exhibited two gigantic hexagonal 

 crystals, one of Apatite (phosphate of lime), the other of Beryl 

 or Aquamarine, the latter measuring fourteen inches in height 

 and one foot along the diagonal of the base. 



