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
Art Smith by BARSE Orange Gemstone & Leather Necklace, Womens
Don t tie yourself to one style explore what s current with a multi-gemstone necklace woven with beige leather. Orange tonal gemstones, including agate and tiger s eye, are stunning for every day. Metal: BrassStones: Genuine multicolor agate, red...Only $87.49 at jcpenney
no photoArt Smith by BARSE Orange Gemstone & Leather Necklace, Womens
$87.49
jcpenney
Black Agate, .10ct t.w. Diamond Scarab Earrings in Gold Over Sterling
Worn since ancient times to represent new life, these scarab earrings are crafted of black agate with .10 ct. t.w. of diamonds. Clip/post, satin-finished 18kt yellow gold over sterling silver earrings.Only $168.75 at Ross-Simons
no photoBlack Agate, .10ct t.w. Diamond Scarab Earrings in Gold Over Sterling
$168.75
Ross-Simons
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
Jasper & Matte Agate Necklace - Brunello Cucinelli - Graphite (ONE SIZE)
Brunello CucinelliJasper & Matte Agate NecklaceDetailsShort necklace by Brunello Cucinelli.Round jasper beads and single matte black agate bead.Leather loop clasp with push-through stud closure.Gunmetal-colored hardware.16inL.Made in Italy.Designer...Only $795.00 at Neiman Marcus
no photoJasper & Matte Agate Necklace - Brunello Cucinelli - Graphite (ONE SIZE)
$795.00
Neiman Marcus
Agate Stick Collar Necklace, Purple - Panacea - Purple
PanaceaAgate Stick Collar Necklace, PurpleDetailsPanacea agate collar necklace.Golden oval chain.2 1/4in center drop.20inL overall.Lobster clasp.Designer About Panacea Fashion Accessories:Defined in the dictionary as a solution for all, Panacea...Only $75.00 at Neiman Marcus
no photoAgate Stick Collar Necklace, Purple - Panacea - Purple
$75.00
Neiman Marcus
Long Pink Agate Station Necklace, 44"L - Jose & Maria Barrera
Jose & Maria BarreraLong Pink Agate Station Necklace, 44inLDetailsHot pink dyed fire agate and jade.24-karat yellow gold plate.Faceted Austrian crystal details.Rolo link necklace.Necklace, 44inL.Lobster clasp.Made in USA of imported materials.Designer...Only $186.00 at Neiman Marcus
no photoLong Pink Agate Station Necklace, 44"L - Jose & Maria Barrera
$186.00
Neiman Marcus
Agate Stick Collar Necklace, Green - Panacea - Green
PanaceaAgate Stick Collar Necklace, GreenDetailsPanacea agate collar necklace.Golden oval chain.2 1/4in center drop.20inL overall.Lobster clasp.Designer About Panacea Fashion Accessories:Defined in the dictionary as a solution for all, Panacea...Only $75.00 at Neiman Marcus
no photoAgate Stick Collar Necklace, Green - Panacea - Green
$75.00
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
Art Smith by BARSE Blue & Red Gemstone 2-Row Pendant Necklace, Womens
A sea of endless gemstones on this bold necklace perks up even the cloudiest day. The blue amazonite pendant in a brass frame gets extra points for a double row of chains in smoky quartz, tiger s eye, agate and red aventurine. Metal: BrassStones:...Only $124.99 at jcpenney
no photoArt Smith by BARSE Blue & Red Gemstone 2-Row Pendant Necklace, Womens
$124.99
jcpenney
Black Agate & Copper Beaded Choker Necklace - Brunello Cucinelli - Black gold (ONE SIZE)
Brunello CucinelliBlack Agate & Copper Beaded Choker Necklace DetailsChoker necklace by Brunello Cucinelli.Multiple strands of matte black agate and faceted copper beads.Leather loop clasp with push-through stud closure.Gunmetal-colored hardware.15-16...Only $1,850.00 at Neiman Marcus
no photoBlack Agate & Copper Beaded Choker Necklace - Brunello Cucinelli - Black gold (ONE SIZE)
$1,850.00
Neiman Marcus
Ray Of Light Agate Sterling Silver Pendant
Weight: 10.80g | Material: Sterling Silver | Main stone: Agate | Other stones: Peridot | Dimension: 2 1/2 1 1/4 inch | Inner Bail Diameter: 1/4 inch | Stamp / Mark: 925 | Condition: New | Main color: blue | Shape: rectangle | Item Code: 11-lip-13-12Only $39.95 at SilverRushStyle.com
no photoRay Of Light Agate Sterling Silver Pendant
$39.95
SilverRushStyle.com
Waterford Crystal Evolution "Agate" Paperweight
Inspired by the naturally occurring colors and striped concentric bands of quartz agate, we present to you this Evolution "Agate" glass paperweight from Waterford Crystal. A dominant warm red hosts a swirling symphony of complementary colors, including...Only $125.00 at Ross-Simons
no photoWaterford Crystal Evolution "Agate" Paperweight
$125.00
Ross-Simons
1.00ct White Topaz, Purple Agate Drop Pendant Necklace. 18"
Convey a sense of royal majesty with this 1.00 carat white topaz and purple agate drop pendant necklace. Round white topaz filigree topper hosts a kite-shaped purple agate dangle with great results. Includes cable chain with springring clasp. Sterling...Only $172.50 at Ross-Simons
no photo1.00ct White Topaz, Purple Agate Drop Pendant Necklace. 18"
$172.50
Ross-Simons
Multi-Stone Scarab Necklace in 14kt Yellow Gold Over Sterling
An RS exclusive. The scarab beetle has been cherished as an auspicious charm for centuries. Here, in affordable composite turquoise, it takes a bold stance upon five strands of lapis and red agate beads. Slide clasp, 14kt yellow gold over sterling...Only $101.25 at Ross-Simons
no photoMulti-Stone Scarab Necklace in 14kt Yellow Gold Over Sterling
$101.25
Ross-Simons
Shining Pink Druzy Agate Sterling Silver Pendant
Weight: 25.00g | Material: Sterling Silver | Main stone: Agate | Other stones: Druzy | Dimension: 2 inch | Inner Bail Diameter: 1/4 inch | Stamp / Mark: 925 | Condition: New | Main color: pink | Shape: abstract | Item Code: 5-lut-13-53Only $40.50 at SilverRushStyle.com
no photoShining Pink Druzy Agate Sterling Silver Pendant
$40.50
SilverRushStyle.com
 


Copyright ©1995-2012 by Amethyst Galleries, Inc.
Site design & programming by galleries.com web services