It varies in colour from greyish to bright yellow or greenish-brown, the first-named being the purest.
The dark base of the mountainous thunderheads had a greenish tinge.
The colour varies somewhat with the chemical composition, being grey or colourless in chlorargyrite, greenish-grey in embolite and bromargyrite, and greenish-yellow to orange-yellow in iodembolite.
Greenish colour, so that they offer no attractions to insect visitors and their form is correspondingly regular.
All the other examples have the lower portion covered in like manner by a network of circles standing nearly a quarter of an inch from the body of the cup. An example connected with the specimens just described is the cup belonging to Baron Lionel de Rothschild; though externally of an opaque greenish colour, it is by transmitted light of a deep red.