Thomsonite Specimen, India ankh Large gray spherical concretion with

Large gray spherical concretion with one side exposed to reveal the internal shrinkage fractures that are lined with iridescent Pyrite microcrystals

the red UV reactivity may fade to a blue color

G and H: You will receive one  randomly selected piece from the items in the photo

This gorgeous Pietersite slab is from China

Weight: 1066g

Thomsonite Specimen, India ankh Large gray spherical concretion withThomsonite, named after prominent chemist Thomas Thomson, is a well named mineral belonging to the zeolite group. Primarily composed of hydrated calcium silicate, it may have minor amounts of sodium and traces of potassium, but lacks barium, strontium, iron, and magnesium. Structurally, it is similar to sodium calcium zeolite mesolite and sodium zeolite natrolite, but does not form a continuous chemical series with either. It can be found in a range