- Metallic element with symbol rh - A rare element of the light platinum group. It is found in
platinum ores, and obtained free as a white inert metal which it is
very difficult to fuse. Symbol Rh. Atomic weight 104.1. Specific
gravity 12.
- Rare metallic element - A rare metallic element of the boron-aluminium group,
found in gadolinite and other rare minerals, and extracted as a dark
gray powder. Symbol Y. Atomic weight, 89.
- A rare metallic element, of uncertain identification,
supposed to exist in certain minerals, as gadolinite and samarskite,
with other rare ytterbium earth. Symbol Tr or Tb. Atomic weight 150.
- A rare metallic element, found in certain zinc ores. It is
white, hard, and malleable, resembling aluminium, and remarcable for
its low melting point (86/ F., 30/C). Symbol Ga. Atomic weight 69.9.
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