Marie afterwards took from one of the geodes a pinch of powder weighing about half a gramme, and cupelled a bright dust-shot bead weighing not less than two centigrammes.
Upon this is a layer of datholite in the form of a crystalline plate, and over or above this, either in the basalt or hanging down into cavities in the sandstone, are the crystals or geodes of datholite.
No caves have been discovered in the Bad Lands, unless that name be applied to some of the geodes which are really grottoes, they being of sufficient size for a man to stand in.
Here all was calcite crystal heavily massed in various forms, and a harmony of blue and brown, with half a dozen round, unbroken, perfect geodes hanging from the ceiling like oriole nests.
But thegeodes show some striking combinations of both crystals and colors with an exterior formed like box work, composed of a very heavy dark material said to be a mixture of barium, calcium and iron.
The material worked was evidently the pink-coloured and silver-scaled micaceous schist; but there was also a whitish quartz, rich in geodes and veinlets of dark-brown and black dust.
The mouth of the northern gorge was blocked by a vein of finely crystallized carbonate of lime, containing geodes and bunches.
Many of these geodes are from a foot to twenty-two inches in diameter, and on breaking them they exhibit resplendent crystals of limpid quartz.
These geodes are sometimes eight or ten inches in diameter, with a rough and dark-colored exterior, often so nearly spherical as to resemble cannon balls.
Also, constituting the interior lining of geodes at the rapids of Rock Island and the River Desmoines.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "geodes" in a variety of sentences. We hope that you will now be able to make sentences using this word.
