| Polyhedroid Agates |
| SpiritRock Shop |
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Polyhedroid Agates are one of nature’s great unexplained formations. These geometric beauties were only found for a
short time in the 1970’s and only in one location in the world. It is fitting that some of the most desirable agates in the world
come from the greatest agate producing country, that being Brazil. These were located in Paraiba the only state in Brazil
that ever produced any of these specimens. These stunning agates formed in geometric pattern shapes rather than the
more common round or oval agate shape. The theories of formation of these agates are still an ongoing evaluation among
geologists. The most agreed upon formation theory seems to be that the sharp geometric shapes are thought to have
been formed in the voids between interlaced crystals of Barite, or possibly Calcite crystal formations.
The agate nodules can be solid or hollow and the best grades have distinct, colorful fortification agate bands that follow
the typically triangular or trapezoidal shape of the Polyhedroid Agate. They are some of the highest quality agates
available, and are able to be polished to the highest mirror glaze finish that quality agates can obtain. These agates rarely
have fractures or other imperfections. Most nodules are quartz with black, gray, white being the predominant colors of the
Polyhedroid agates. Shapes can be a variety of geometric forms with the equilateral triangle shape being the most
desirable shape. (One cannot help but wonder if Euclid, the father of Geometry found some of these agates or maybe
nature made these just to prove Euclid’s theorems.) The Polyhedroid Agate makes the best agate show piece and
conversation piece in any collection. These are very rare and expensive….but like they say…”You get what you pay for!”
These are our favorites!
short time in the 1970’s and only in one location in the world. It is fitting that some of the most desirable agates in the world
come from the greatest agate producing country, that being Brazil. These were located in Paraiba the only state in Brazil
that ever produced any of these specimens. These stunning agates formed in geometric pattern shapes rather than the
more common round or oval agate shape. The theories of formation of these agates are still an ongoing evaluation among
geologists. The most agreed upon formation theory seems to be that the sharp geometric shapes are thought to have
been formed in the voids between interlaced crystals of Barite, or possibly Calcite crystal formations.
The agate nodules can be solid or hollow and the best grades have distinct, colorful fortification agate bands that follow
the typically triangular or trapezoidal shape of the Polyhedroid Agate. They are some of the highest quality agates
available, and are able to be polished to the highest mirror glaze finish that quality agates can obtain. These agates rarely
have fractures or other imperfections. Most nodules are quartz with black, gray, white being the predominant colors of the
Polyhedroid agates. Shapes can be a variety of geometric forms with the equilateral triangle shape being the most
desirable shape. (One cannot help but wonder if Euclid, the father of Geometry found some of these agates or maybe
nature made these just to prove Euclid’s theorems.) The Polyhedroid Agate makes the best agate show piece and
conversation piece in any collection. These are very rare and expensive….but like they say…”You get what you pay for!”
These are our favorites!
| Polyhedroid Slab from Paraiba Brazil Beautifully polished on both faces! This exciting "Old Stock" piece is from our personal collection. This amazing piece has clear crackle appearance quartz with a blue-grey band in the center of the quartz band. The interior black chalcedony opens to a stunning botryoidal interior. This specimen weighs 0.2 lb (95.5g) and measures 3.2 x 2.5 x 0.3 to 0.5 inches (82 x 64 x 8.7 to 14mm) |
| Polyhedroid Slab from Paraiba Brazil Polished on 1 side, superb free standing display piece! This piece weighs 0.63 lbs (289g) and measures 6 x 1.7 x 1.1 to 0.88" (15.3 x 4.5 x 2.8 to 2.2cm) |
| Item # PHA11101933 6" Polyhedroid Agate Thick Slab $101.00 Quantity Available 1 each |
| Don't Miss This One! |
| Item # PHA10102763 Rare Intact Polyhedroid Agate $110.00 Quantity Available 1 each |
| Rare Intact Polyhedroid Agate from Paraiba Brazil From our personal collection we present this rare, intact polyhedroid agate specimen. It is a superb quartz formation with all sides intact with the cut face being nicely polished. The quartz interior almost appears to be a coarse drusy finish A truly unique Polyhedroid collection specimen! This piece weighs 0.27 lb (124g) and measures 3 x 1.6 x 2.4 inches (78 x 41 x 60mm) |
| Don't Miss This One! |
| Polyhedroid Slab from Paraiba Brazil Polished on 1 side, beautiful free standing display piece! This piece weighs 0.38 lbs (174g) and measures 5.8 x 1.7 x 0.62 (5/8)" (147 x 44 x 15.7mm) |
| Item # PHA11101732 5.8" Polyhedroid Agate Thick Slab $74.00 Quantity Available 1 each |
5/8" Thick!
1-1/16" to 7/8" Thick!
| Don't Miss This One! |
| Don't Miss This One! |
| Polyhedroid Slab from Paraiba Brazil Beautifully polished face! This exciting piece is from our polyhedroid collection. This amazing piece has clear crackle appearance quartz with a black-grey band in the center of the quartz band. The interior vug chalcedony forms to a stunning botryoidal interior. This specimen weighs 7oz (199g) and measures 5.2 x 2.9 x 0.6 to 0.37 inches (134 x 75 x 15 to 9mm) Piece has one natural fracture |
| Item # PHA11103934 Polyhedroid Agate Slab with Black Botryoidal Bubbles $90.00 Quantity Available 1 each |
| Item # PHA10103972 Polyhedroid Agate Slab with Black Botryoidal Bubbles $85.00 Quantity Available 1 each |
| Both Faces Polished! |
| Notice to Our Customers We will be closed from May 18th through August 15th 2012 to relocate our business. Orders placed during this time will not be shipped until after August 15th. Purchases or Reservations will be honored in the date order they are received. 1st purchaser is served 1st. |