Cave Pearls: The same Calcite that forms stalactites and stalagmites sometimes forms around a grain of sand, forming "Cave Pearls". You can not take them from the cave without them drying out and disintegrating.
Black Opal is Australia’s national gemstone. Found in the Lightning Ridge area in northwestern New South Wales, black opals are natural, solid stones that absorb scattered white light, giving it brilliant spectral colors.
Boytroidal Chalcedony~ This beautiful stone absorbs negative energy then dissolves it to avoid further transmission, and can also transmute negative feelings into joy; harmonizes the mind, body, and spirit making it excellent for use in telepathy