AGATE, a banded variety of Chalcedony

VARIETY INFORMATION:

  • VARIETY OF: Crypto-crystalline Quartz , SiO2
  • USES: Gemstone and ornamental stone.
  • COLOR: Nearly any color, even colorless. The key is the presence of banding
  • HARDNESS: 7
  • CLEAVAGE: none
  • CRYSTAL SYSTEM: none visible (actual crystals are microscopic)
  • For natural Agate mineral specimens see our For Sale or Sold lists

Agate is the term for banded chalcedony. It is often found as the layers lining geodes deposited in different colors as a quartz geode formed contained different impurities (or even none, resulting in a white or colorless band).

As a general term, agate is so broadly descriptive that there are hundreds of names applied to varieties of agate from different localities. While many names reflect the source, some popular varieties are descriptive, such as "blue lace agate".

Note that in come cases, the term "agate" is used where the term "jasper" may be more accurate, as in "moss agate" in which a white quartz contains a fractal pattern of green and black, resembling tiny blades of moss.

Agate is primarily formed by the deposit of silica from solution; it is also a common method of fossilization, as the organic remains of some living thing are gradually replaced by quartz. "Agatized coral" from the Tampa Bay area is an excellent example, as are all of the specimens of petrified wood.

Agate is only one of several chalcedony (cryptocrystalline quartz) varieties. The primary varieties are as follows:

  • Agate is a banded variety (sometimes with translucent bands)
  • Bloodstone is green with red speckles
  • Carnelian is yellow to orange
  • Chrysoprase is green
  • Flint is generally black with a fibrous microscopic structure
  • Jasper is any colorful agate
  • Onyx is black, white, or alternating black and white
  • Sard is yellow to brown
  • Sardonyx is banded, alternating sard and (usually white) onyx
Agate Jewelry - Hover over an item for more information
16mm Cultured Pearl Frog Pendant Necklace, Black Agate. 18"
Our cute pond pal is sterling silver with black agate eyes and a 16mm cultured freshwater pearl. Happy little frog dangles from a rope chain with springring clasp. Sterling silver pendant necklace. Pearl birthstones are the perfect gift for June...Only $85.00 at Ross-Simons
no photo16mm Cultured Pearl Frog Pendant Necklace, Black Agate. 18"
$85.00
Ross-Simons
DeBuman Agate and Cultured Pearl Necklace HF-N-2 0274 0020
DeBuman Agate and Cultured Pearl Necklace This necklace features cultured white freshwater pearl and gemstones with a lobster clasp. It is adjustable and good for everyday wearing. Features: -Chain material: Copper.-Stone type:...Only $32.54 at Wayfair
no photoDeBuman Agate and Cultured Pearl Necklace HF-N-2 0274 0020
$32.54
Wayfair
ZOE + SYD Genuine Fire Agate & Crystal Statement Necklace, Womens
For instant drama and appeal, our statement collar adds kick to any outfit. Featuring three rows of genuine fire agate and crystals on a beaded chain, this necklace is perfect for holiday or everyday wear. Metal: Gold-tone metalStones: Genuine fire...Only $124.98 at jcpenney
no photoZOE + SYD Genuine Fire Agate & Crystal Statement Necklace, Womens
$124.98
jcpenney
Agate Pendant Necklace, Gray - Panacea - Gray
PanaceaAgate Pendant Necklace, GrayDetailsPanacea agate pendant necklace.Agate pendant with golden edges, 1 3/4inH x 1 1/2inW.10in golden chain drop includes 1in chain extender.Lobster clasp.Designer About Panacea Fashion Accessories:Defined in the...Only $53.00 at Neiman Marcus
no photoAgate Pendant Necklace, Gray - Panacea - Gray
$53.00
Neiman Marcus
Porous Gold Plated Teardrop & Pink Agate Necklace - Devon Leigh - Gold
Devon LeighPorous Gold Plated Teardrop & Pink Agate NecklaceDetailsPink agate Devon Leigh necklace.18-karat yellow gold electroplate teardrop pendant with porous cutouts.14-karat yellow gold fill chain and lobster clasp.2in extender with logo...Only $495.00 at Neiman Marcus
no photoPorous Gold Plated Teardrop & Pink Agate Necklace - Devon Leigh - Gold
$495.00
Neiman Marcus
Black Agate Spike Necklace - Nest - Black
NestBlack Agate Spike NecklaceDetailsTwo layered strands of natural black agate spikes, polished to perfection.Approximately 19-21inL.4in at widest.Lobster clasp.Made in USA.Only $177.00 at Neiman Marcus
no photoBlack Agate Spike Necklace - Nest - Black
$177.00
Neiman Marcus
Long Gray Stone Necklace, 46" - Jose & Maria Barrera - Gold
Jose & Maria BarreraLong Gray Stone Necklace, 46inDetailsLong station necklace by Jose & Maria Barrera.24-karat yellow gold plate.Gray ghost agate and glass beads.Pave Austrian crystal details.Approx. 46inL with 3in extender.Fold-over clasp.Made in the...Only $415.00 at Neiman Marcus
no photoLong Gray Stone Necklace, 46" - Jose & Maria Barrera - Gold
$415.00
Neiman Marcus
Green Jade Teddy Bear Pendant Necklace, Black Agate in Gold. 18"
This cute green jade teddy bear pendant holds a golden star and peers with black agate eyes. Pendant is suspended from a 14kt yellow gold bale and rope chain. Springring clasp, 14kt yellow gold necklace.Only $79.95 at Ross-Simons
no photoGreen Jade Teddy Bear Pendant Necklace, Black Agate in Gold. 18"
$79.95
Ross-Simons
Pear-Shaped Red Agate Drop Earrings in 14kt Yellow Gold
Open pear-shaped red agate sways from these drop earrings, casting a smooth and succulent hue. Earwire, 14kt yellow gold earrings.Only $145.00 at Ross-Simons
no photoPear-Shaped Red Agate Drop Earrings in 14kt Yellow Gold
$145.00
Ross-Simons
PALOMA & ELLIE Pink Agate Statement Necklace, Womens
Make a glamorously feminine statement with this large-scale necklace in stylish, gold-tone metal with lovely, pink agate stones. Metal: Gold-tone metalStones: Color-treated pink agateClosure: Lobster claspDue to the nature of large pink agate,...Only $59.99 at jcpenney
no photoPALOMA & ELLIE Pink Agate Statement Necklace, Womens
$59.99
jcpenney
Graduated Black Agate and Pearl Necklace in 14kt Yellow Gold. 16"
Timeless black and white for day or night. Strung with faceted black agate beads and 8-8.5mm cultured freshwater pearls. Necklace presented with 14kt yellow gold spacers and clasp.Only $95.00 at Ross-Simons
no photoGraduated Black Agate and Pearl Necklace in 14kt Yellow Gold. 16"
$95.00
Ross-Simons
Simone 18k Gold Agate Chandelier Earrings - Elizabeth Showers - White (18k )
Elizabeth ShowersSimone 18k Gold Agate Chandelier EarringsDetailsSet in 18-karat gold, these white agate Elizabeth Showers earrings will sate your lust for luster.White agate.18-karat yellow gold.White pave diamonds.0.06 total diamond carat weight.1...Only $1,745.00 at Neiman Marcus
no photoSimone 18k Gold Agate Chandelier Earrings - Elizabeth Showers - White (18k )
$1,745.00
Neiman Marcus
Black Agate and Mother-Of-Pearl Elephant Pendant With 14kt Yellow Gold
The elephant on this pendant has his trunk all the way up - a symbol of good luck and prosperity. The figure is carved into mother-of-pearl on a black agate disc. Pendant finishes with a 14kt yellow gold bale which fits up to a 3mm chain, sold...Only $95.00 at Ross-Simons
no photoBlack Agate and Mother-Of-Pearl Elephant Pendant With 14kt Yellow Gold
$95.00
Ross-Simons
Pear-Shaped White Agate Drop Earrings With Diamonds in Sterling Silver
Smooth open drops of pear-shaped white agate bring a fresh look to these classy earrings. Accented with diamonds for a hint of shimmer. Post/clutch, sterling silver earrings.Only $97.50 at Ross-Simons
no photoPear-Shaped White Agate Drop Earrings With Diamonds in Sterling Silver
$97.50
Ross-Simons
Sterling Silver Drusy Agate Pendant
Handmade by Master Artisan. See more details at JeGem.com.Only $123.74 at JeGem.com
no photoSterling Silver Drusy Agate Pendant
$123.74
JeGem.com
 


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