There are several sites of Thundereggs around Magnitogorsk. These differ in terms of colour and structure of the Lithophysae, as well as by its content.
We can see both a weak and a delicate, beautifully contrasting banding - depending on location. Also needlelike pseudomorphs are quite common at some sites.
In the colour the agates differ from Magnitogorsk also: some sites offer only grey and white tones - on others there are also yellowish and brownish colors to be find.