Garnet 5-8mm Natural Nugget - 15-16 Inch Size_8x10-9x13mm The shell is often found

The shell is often found naturally polished with a green or brown spiral on one side and a white "eye" on the other

cacoxenite

and therefore is not an Agate in the strictest terms

The most common members of the feldspar group are the plagioclase feldspars and the alkali feldspars

Garnet 5-8mm Natural Nugget - 15-16 Inch Size_8x10-9x13mm The shell is often foundGarnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. All species of garnets possess similar physical properties and crystal forms, but differ in chemical composition. The different species are pyrope, almandine, spessartine, grossular (varieties of which are hessonite or cinnamon stone and tsavorite), uvarovite and andradite.