This is a gorgeous slab of Turkish Stick agate from the mines of Ankara, Turkey. It is polished to a mirror-finish on one side and features beautiful fanning aragonite "stick" crystal formations that have become encapsulated in agate.
This specimen comes with an acrylic display stand.
Stick Agate, also known as "Needle Agate", is a formation of agate that comes from mines in Ankara, Turkey. Much of the time, this agate features stick-like formations that are surrounded by agate. This occurs when agate fills a cavity within a rock that already contains mineral formations throughout. In the case of these stick agates from Turkey, the agate
formed as a pseudomorph after aragonite and/or sagenite crystals. In some cases, these aragonite crystals form as hollow tubes that when polished will contain agate and/or druzy quartz within.
Agate is a variety of microcrystalline quartz that displays translucence and in some cases banding. Agate primarily forms when silica-rich fluids fill pockets within rock and/or fossils, resulting in deposition of the silica along the walls of the rock. This process can result in banding patterns as the composition and impurities of the fluids change over time. These banding patterns can either form as flat layers or rounded layers, depending on the surfaces available for deposition.