| Polyhedroid Agates |
| SpiritRock Shop |
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| Polyhedroid Agates are also from the great agate producing country of Brazil, but were found in only 1 locale in Paraiba, a state in the northern sector of Brazil. These unconventional shaped agates are geometric patterns rather than the traditional roundish look of most agates. These wonderful specimens were only available for a very short time in the 1970's and are extremely difficult to locate today. These were very popular as jewelry items in the 1970's. The formation of these agates is still a topic of discussion among geologists. The most agreed upon formation theory seems to be that It's sharp geometric lines are thought to be the result of the agates forming in the interstices between tabular crystals of calcite. In other words, the agate formed in the somewhat randomly shaped angled spaces between calcite crystal formations. The agate nodules themselves are sometimes hollow and the best grades feature sharp, colorful fortification agate bands that follow the typically triangular or trapezoidal shape of the pseudo morph. They are high quality agates, rarely having any fractures and capable of being polished to the highest quality finish the best agates can obtain. If you want to add a true showpiece to your collection that you and your friends can admire for years to come, you really should invest in one. Most Polyhedroid nodules are quartz geodes. Black, gray, white seem to be most common colors of the Polyhedroid agates. Shapes can be a variety of well defined geometric forms. Polyhedroid agates are natures answer to, or maybe the inspiration for Euclid's geometry. |
| Polyhedroid Slab from Paraiba Brazil Unpolished 6.5" x 1.75" x .14" (164 x 43 x 3.5mm) |
| Item# PHA0508002 6" Polyhedroid Agate Slab $38.00 |
| Polyhedroid Slab from Paraiba Brazil Unpolished 6" x 1.67" x .14" (154 x 42 x 3.5mm) |
| This specimen weighs 0.45 lb (206g) and is 2.5 x 1.65 x 2.6 inches (64 x 42 x 66mm) |
| This is a Very Rare Polyhedroid Agate specimen from Paraiba, Brazil, old 1970’s stock. Large enough to produce many slabs of a stunning display specimen as is. The interior is coated in a crystal structure. The front face is dome polished. This specimen displays a distinct black border around a grey to clear color with a clear outer band around the black. It has multiple angles and is a very good sample of this rare occurrence. |
| Item # PHA0508001 6.5" Polyhedroid Agate Slab $40.00 Quantity Available 1 each |
| Item# 0508003 Polished Face Polyhedroid Agate $54.00 Quantity Available 1 each |