http://www.m516.com/black-agate/
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 8x12mm Black Striated Agate Beads 16 $5.99 Time Remaining: 30m |
 Beautiful Fashion Jewelry Black Agate Jade Silver Drop Dangle Earrings y39 $5.89 Time Remaining: 31m Buy It Now for only: $5.89 |
 23x50mm White Black Crystal Agate Oval Beads 15 $8.99 Time Remaining: 31m |
 60 73mm black druzy agate freeform pendant bead S838 $4.99 Time Remaining: 31m |
 10x30 11x32mm Black Fire Agate Long Oval Beads 14 $5.99 (1 Bid) Time Remaining: 32m |
 8mm Black Agate Gemstone Round Loose Beads 155 Long New +++ $2.00 (2 Bids) Time Remaining: 34m |
 Carved Face Agate Tourmaline Black Onyx 925 Silver Earrings 67mm 2893 $5.37 (5 Bids) Time Remaining: 35m |
 Black Agate Druzy Geode Pendant Bead H141797 $3.99 (1 Bid) Time Remaining: 36m |
 12mm faceted black crab fire agate Round Beads 75 strand 11 pcs $0.99 (1 Bid) Time Remaining: 37m |
 Black Agate Druzy Geode Pendant Bead H141799 $3.99 (1 Bid) Time Remaining: 38m |
 Black Dragon Veins Agate Oval Beads 25x35mm 13inch $6.50 Time Remaining: 39m |
 Black Agate Druzy Geode Pendant Bead H141801 $3.99 Time Remaining: 41m |
 Black Agate Gold Pyrite Drop Earrings Gold Gemstone Handmade Jewellery NEW $3.15 Time Remaining: 41m |
 10x15mm Black Striated Agate Nugget Beads 20pcs $5.99 Time Remaining: 41m |
 AGATE CABOCHON SILVER AND BLACK BELT BUCKLE $14.99 Time Remaining: 43m |
 faceted 16mm dream crab Agate round loose Beads 15 $6.50 (1 Bid) Time Remaining: 44m |
 Natural Black AGATE GEMSTONE 1 5 8 PENDANT $0.99 Time Remaining: 44m |
 H0626 8mm Black Agate Ball Loose Beads 15 $3.99 Time Remaining: 44m |
 10x14mm Black Fire Agate Rondelle Beads 145 $6.99 Time Remaining: 44m |
 6mm Black Agate Onyx Round Loose Beads Gemstone 15 $0.99 Time Remaining: 44m |
 36x27MM Teardrop Black Agate Bead Gemstone Pendant 18KGP S082 $2.99 Time Remaining: 47m |
 DENDRITIC OPALITE AGATE BLACK ONYX 925 Silver Pendant 2 465 g $15.99 Time Remaining: 48m Buy It Now for only: $15.99 |
 BLACK AGATE 2 3 4 WIRE WRAP PENDANT $4.13 (2 Bids) Time Remaining: 49m |
 Natural Black Mashan Jade Round 6mm Loose Beads 16 $0.62 (3 Bids) Time Remaining: 50m |
 4mm Black Agate Onyx Gemstone Round Loose Bead 15 $0.01 Time Remaining: 53m |
 10x30MM Black Agate Drip Loose Beads 13pcs AG009 $9.42 Time Remaining: 53m Buy It Now for only: $9.42 |
 Black Fuschia Agate Slice Pendant Necklace $17.95 Time Remaining: 53m Buy It Now for only: $17.95 |
 L57047 Two Black agate beads set $7.00 Time Remaining: 54m |
 Natural Black Agate Blue Goldstone Pearl 20 Necklace Handmade Jewellery $5.06 (2 Bids) Time Remaining: 54m |
 BLACK CHERRY AGATE GEMSTONE RONDELLE 14X10MM LOOSE BEADS 16 $4.99 Time Remaining: 54m |
 NATURAL BLACK AGATE GEMSTONE PENDANT 1 1 2 $0.99 Time Remaining: 54m |
 100 Satisfaction Hand Made Lovely Lucky Cat Ceramics Bracelets Black Agate $5.99 Time Remaining: 59m Buy It Now for only: $5.99 |
 8mm Black Agate Gemstone Round Loose Beads 15 $0.01 Time Remaining: 1h |
 1 1 2 NATURAL BLACK AGATE GEMSTONE PENDANT $0.99 Time Remaining: 1h 1m |
 26X18MM BLACK STRIPE AGATE OVAL Bead Bracelet 8L 1X $11.69 Time Remaining: 1h 1m Buy It Now for only: $11.69 |
 Natural Black Botswana Agate Dragons Vein Agate 19 Necklace Handmade Jewelry $6.62 (2 Bids) Time Remaining: 1h 3m |
 13x18MM Flat Oval Black Agate Onyx Gem Loose Bead 15 $0.01 Time Remaining: 1h 4m |
 Black Feather Plume Agate Slab from Wyoming $5.24 (2 Bids) Time Remaining: 1h 7m |
 12mm black onyx agate donut beads 16 strand $0.99 Time Remaining: 1h 7m |
 Jay King Mine Finds Raspberry Colored Freshwater Pearls w Black Agate $39.99 Time Remaining: 1h 8m |
 Onyx Agate Tube Gemstone Loose Beads Gemstone 8X10MM $5.59 (1 Bid) Time Remaining: 1h 8m |
 BLACK AGATE FASHION RING $10.00 Time Remaining: 1h 9m Buy It Now for only: $10.00 |
 12mm Black Agate Tibetan DZI Eyed GEM Ball Loose Beads $8.99 Time Remaining: 1h 10m |
 25X35MM Onyx Agate Rectangle Loose Beads Gemstone 16L $5.59 (1 Bid) Time Remaining: 1h 10m |
 6mm Black Agate Gemstone Round Loose Beads 155 Long New +++ $0.99 (1 Bid) Time Remaining: 1h 12m |
 100pcbeautiful black striped agate Gemstone Beads 6 mm MN1006B $1.76 (2 Bids) Time Remaining: 1h 12m |
 NATURAL BLACK AGATE GEMSTONE SOLID COPPER PENDANT 2 $0.99 Time Remaining: 1h 16m |
 BLACK BOTSWANA AGATE PERIDOT PEARL 925 SILVER PENDANT 2 $7.99 Time Remaining: 1h 17m |
 Eds Neat Stuff Black and White Agate Cabochon Ice Skating Time $38.00 (10 Bids) Time Remaining: 1h 18m |
 Black Striped Agate Beads 16 inches Tumbled Nugget $5.99 Time Remaining: 1h 21m |
 Black Agate Long Leaf Ring in Size10 $17.00 Time Remaining: 1h 24m |
 Black Agate Pyramid CZ Vines Ring in Size10 $24.00 Time Remaining: 1h 26m |
 4X Black Agate Golden Dragon Pendant Loose Beads 16mm $5.99 (1 Bid) Time Remaining: 1h 26m |
 2PCS Faceted 12mm Black Agate Tibetan Heaven Eye Eyed GEM Gemstone Loose Beads $2.88 Time Remaining: 1h 26m |
 Black Agate CZ Burst Ring in Size10 $19.00 Time Remaining: 1h 26m |
 2PC Faceted Black Agate GEMSTONE Tibetan Eyed DZI Prayer 12mm Ball Loose Beads $2.88 Time Remaining: 1h 26m |
 Jay King MINE FINDS Black Persian Red Gray Agate 375 Necklace Sterling Silver $49.99 Time Remaining: 1h 26m Buy It Now for only: $49.99 |
 Outlined CZ Flower Rectangular Black Agate Ring in Size10 $22.00 Time Remaining: 1h 27m |
 Outlined CZ Flower Rectangular Black Agate Ring in Size11 $22.00 Time Remaining: 1h 28m |
 20x40mm 14inch Black Agate Oval Beads $4.50 Time Remaining: 1h 29m |
 Black Agate Horizontally Ribbed Ring in Size11 $22.00 Time Remaining: 1h 32m |
 Black Onyx White Agate Ring in Size11 $20.00 Time Remaining: 1h 32m |
 BLACK AGATE FASHION GEMSTONE RING $10.00 Time Remaining: 1h 33m Buy It Now for only: $10.00 |
 Faceted 12mm Black Agate Tibetan Heaven Eye DZI GEM Gemstone Loose Beads 15L $8.99 Time Remaining: 1h 34m |
 Beautiful colored pearl black Agate Necklace $0.10 Time Remaining: 1h 34m |
 10mm Black Agate Gemstone Round Loose Beads 155 Long New +++ $2.25 (2 Bids) Time Remaining: 1h 35m |
 BRAZILIAN AGATE NECKLACE IN BLACK CREAMY AGATE BLUSH W BRIOLETTE 020 26 $9.99 Time Remaining: 1h 36m Buy It Now for only: $9.99 |
 new 10mm black crackle Agate round loose Beads 15 high quality gemstone $0.99 (1 Bid) Time Remaining: 1h 38m |
 w54443 Black onyx agate loose beads $9.99 Time Remaining: 1h 38m |
 F0005303 Charming Black stripes Agate pendant bead $2.99 Time Remaining: 1h 39m |
 1 3 4 NATURAL BLACK AGATE GEMSTONE PENDANT $0.99 Time Remaining: 1h 41m |
 Black Agate Druzy Geode Pendant Bead G140315 $3.99 Time Remaining: 1h 44m |
 Black Agate Druzy Geode Pendant Bead G140317 $3.99 Time Remaining: 1h 46m |
 Black Agate Druzy Geode Pendant Bead G140319 $3.99 (1 Bid) Time Remaining: 1h 48m |
 Black Agate Pyramid CZ Vines Ring in Size9 $24.00 Time Remaining: 1h 49m |
 Black White Agate Ball in Size10 $17.00 Time Remaining: 1h 51m |
 Black Onyx White Agate Ring in Size10 $20.00 Time Remaining: 1h 52m |
 Black Circular Agate CZ Star Ring in Size10 $17.00 Time Remaining: 1h 55m |
 agate Black White round faceted 8mm 15 gemstone beads $1.80 (3 Bids) Time Remaining: 1h 56m |
 red and black agate round faceted 8mm 15 gemstone beads $1.76 (3 Bids) Time Remaining: 1h 56m |
 Adjustable Pink Black Dragon veins Agate gemstone bead handmade Jewelry Bracelet $5.99 Time Remaining: 1h 57m |
 14mm faceted black crab fire agate round beads 75 strand 9 pcs $0.99 (1 Bid) Time Remaining: 1h 58m |
 8x16mm Black Agate Onyx Gems Loose Beads 155 Long AAA+++ $1.25 (2 Bids) Time Remaining: 1h 59m |
 Circular Black Agate Modern Ring JR3250 in Size10 $19.00 Time Remaining: 2h |
 j86953 Black onyx agate pendant beads set $5.00 Time Remaining: 2h |
 Spiked Black Agate CZ Tortoise Ring in Size10 $26.00 Time Remaining: 2h 2m |
 3x10mm Black Agate Wheel Beads 57pcs $5.99 Time Remaining: 2h 2m |
 red black agate faceted 14mm drop gemstone beads $7.99 Time Remaining: 2h 5m |
 green black agate faceted drop gemstone beads $7.99 Time Remaining: 2h 5m |
 Black Agate Horizontally Ribbed Ring in Size10 $22.00 Time Remaining: 2h 6m |
 agate black orange egg faceted 1230mm 11pcs $11.99 Time Remaining: 2h 6m |
 agate black blue egg faceted 1230mm 11pcs $11.99 Time Remaining: 2h 6m |
 agate black white egg faceted 1230mm 11pcs $11.99 Time Remaining: 2h 6m |
 agate black pinkred egg faceted 1230mm 11pcs $11.99 Time Remaining: 2h 6m |
 155 35 458 10mm natural faceted green and black agat $13.99 Time Remaining: 2h 6m |
 Jay King Mine Finds Mother of Pearl w Dyed Rd Blk Shell w Blk Agate Chain $39.99 Time Remaining: 2h 9m |
 Spiked Black Agate CZ Tortoise Ring in Size5 $26.00 Time Remaining: 2h 9m |
 Ss57 Black Agate Gemstone GEM 6mm Round Ball Loose Beads Strand Findings 155L $3.99 Time Remaining: 2h 10m |
 j86969 Carved black agate fish figurine $4.00 Time Remaining: 2h 10m |
 10mm FACETED Black Red Fire Agate Round Beads 15 B $6.95 Time Remaining: 2h 10m Buy It Now for only: $6.95 |
black onyx?
Is black agate and onyx the same thing and
does black onyx have to have alternating bands of different color
Yes, they are both subcategories of chalcedony. Agate is defined as having concentric banding, while onyx has flat layered bands. However, since lots of black onyx is dyed anyway, most rock shops will sell it as 'black onyx' even though it is not banded. True onyx is supposed to black and white banded, but in practice all sorts of chalcedony get labeled as onyx.
Here is what Mindat has to say about onyx:
http://www.mindat.org/min-2999.html
Agate:
http://www.mindat.org/min-51.html\
Chalcedony:
http://www.mindat.org/min-51.html
Neither chalcedony, agate, or onyx qualify as a mineral because they are a mixture of quartz and moganite.
The calcite form is actually called onyx-marble (and is illegal or inadvisable to own in some US states because it comes from cave formations).
http://www.mindat.org/min-3000.html
Jay King Turquoise and Black Agate Sterling Silver 24 Ne...