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Agate is actually considered "quartz", and so is not a valid mineral "species" in and of itself.
According to "gemstones.nowmore.net": Agate is a term applied not to a distinct mineral species, but to an aggregate of various forms of silica, chiefly chalcedony. (pronounced cal-sid-ney).
These agates were tumbled by the sea, some were tumbled in a rock tumbler.
There are many varieties of agate and they can be distinguished by their color and banding and other characteristics such as dendrites (fern-like patterns) and plumes, etc).
WHEN YOU ORDER THE AGATE YOU WILL GET ONE LARGE OR A COUPLE SMALL PIECES. A small piece is about 3/8 to .5 inches, round, a large piece is 5/8 to .75 round (approximately).
Small baggie containing a couple of pieces. Good for new collectors of all ages and use in crystal grids and healing work.
ABOUT THESE AGATES:
These agates are among some of the agate that my Granny and I picked up off the beach in Northern California.
Some she picked up on her travels elsewhere. Some have been tumbled in a rock tumbler, others are tumbled by natural means (surf).
A small piece is about 3/8 to .5 inches, round, a large piece is 5/8 to .75 round (approximately).