148. In the following table all substances which crystallize on the cubical system are arranged according to their chemical formulæ; the letters c, o, and d, representing that faces parallel to the cube, octahedron, and rhombic dodecahedron, occur on their crystals. The crystals having faces parallel to other forms have been previously enumerated under those forms. The table is principally taken from Rammelsberg's Crystallographic Chemistry. Chemical Formula of Substances crystallizing on the Cubical System. Ag, Silver (o cd) Mg, Periclase (oc) Ni (oc) Ca + Ti, Perowskite (od) Ca + 4 B, Bhodozite (o d) Fe + (Fe Ti), Iserine (o cd) Pb' Sb"", Steinmannite (o c) Ni', Grünauite (o c) (Ni Co)3 S Ni Sb+Ni"", Ullmanite (o cd) 4(Fe 2 Ca') + As", Tennantite (ocd) Na's Sb'"+18 aq (od) Fe Ni', Eisennickelkies (0) (2 Єu' + Sn") + (Fe' + Sn'), Stannine (cd) Ni'+Ni As2, Gersdorffite (o c) Am Cl+Mn Cl+aq (cd) Ca Cl+5 Hg Cl+8 aq (0) [2 (K Am) Cl+Fe Cl3]+2 aq (Ni Cl+2N H3) +aq (o cd) Am Cl+Sn Cl2 (o cd) K Cl+Pt Cl2 (0) (Pb Cl+Pb)+(Cu Cl+Cu) + aq, Percylite (o cd) 2 Ag Br+3 Ag Cl, Embolite oc Zn Br+N H3 (0) Co Cl+6 aq Cu Cl+6 aq (0) Ca Br+N H3 (0) Where R = Ca, Fe, Mn, and R'=Fe, Al Ca3 Si2+ Si, Uwarrowite (od) (Mn, Fe) Si2+ Be Si+Am S, (Ni Ñ + 2N H3) + aq (o c) Na W + W W (c) undetermined: Hauyne, or Lapis Lazuli, a silicate of Alumina, Soda, and Lime (o cd) Pyrochlore, Titanium ore (o cd) Tritonite, Silicate of oxides of Cerium and Lanthanium (c) Voltaite, Hydrous sulphate of iron, &c. (o cd) ** A discussion* followed, in which C. BROOKE, Esq., F.R.S., Professor MORRIS, the HONORARY SECRETARY, and the CHAIRMAN took part; after which The Meeting was adjourned. * This discussion having been of a very general character, it has not been found necessary to insert it. |