Agate / Chalcedony

Agate from Maly Lagerny, near Petropavlovsk-Kamchatskii.
[photo/collection: Maurice de Graaf]

Chalcedony from Alikonovka, near Kislovodks, Caucasus. The brown dots look like limonite octahedrons (pseudomorph after magnetite)
[photo/collection: Maurice de Graaf]

Flint from Peski station Moscow obl.
[photo/collection Viktor Slyotov]

Chalcedony from Staraya Sitnya, near Stupino, Moscow obl.
[photo/collection Viktor Slyotov]

Agate from Staraya Sitnya, near Stupino, Moscow obl.
[photo/collection Viktor Slyotov]

Agate from Rusavkino, Moscow Oblast colored by hematite and goethite.
[photo/collection: Viktor Slyotov]

Polished gemmy jasper from Karagaz Tau, Bashkiria
[photo/collection: Maurice de Graaf]