Slag Glass

Does anyone know what Slag Glass is?

I just recently purchesed a large--at least 25 lbs--yellow chunk of what to me looks like glass. I just wanted to know if anyone knows if there is anything that looks similar to this that isnt slag glass. The piece I bought is amorphous and has concoidal fractures on some edges, so I know that it is some sort of glass but what I don't know is whether it could be artifical--a bi-product of smelting iron-ore, or whether this is some odd form of obsidian (but again i dont think so because of its felsic/ light color. Can anyone give me some insight into what you think this could be?

Slag (the by-product of smelting ore) can be vitreous, so it is possible to confuse it with glass. It can also contain sulfides, which may give it that yellowish color.

Just did an internet search, and in the early part of the 20th century, iron ore slag was ground into a powder to make "agate glass", which was also known as "slag glass".

Find Slag Glass On eBay Below:

PELES GLASS HAWAII Pineapple FIGURINE PAPERWEIGHT Iridescent Glass Slag
PELES GLASS HAWAII Pineapple FIGURINE PAPERWEIGHT Iridescent Glass Slag
$13.46
FENTON ORANGE PUMPKIN SLAG BRIDESMAID DOLL GREAT BRIGHT COLOR
FENTON ORANGE PUMPKIN SLAG BRIDESMAID DOLL GREAT BRIGHT COLOR
$50.00
Three Blue  White Swirl Slag Glass Planters on Music Note Wire Holder GC
Three Blue White Swirl Slag Glass Planters on Music Note Wire Holder GC
$30.00
Akro Agate 657 Small Rectangular Planter White  Green  Brown Slag Glass
Akro Agate 657 Small Rectangular Planter White Green Brown Slag Glass
$20.00
Stellar Iridescence Rindskopf Iridized Marble Slag Glass Vase Exquisite
Stellar Iridescence Rindskopf Iridized Marble Slag Glass Vase Exquisite
$79.00
Akro Agate Lily Vases Brown and White Slag Glass Pair
Akro Agate Lily Vases Brown and White Slag Glass Pair
$26.24
LE Smith Orange Slag Glass Vase 14 Tall
LE Smith Orange Slag Glass Vase 14 Tall
$12.00
Slag Glass Lighthouse Purple Ruby Red Sun Catcher Hand Made
Slag Glass Lighthouse Purple Ruby Red Sun Catcher Hand Made
$19.99
Kemple Collectors ID Guide Pattern Milk  Slag Glass
Kemple Collectors ID Guide Pattern Milk Slag Glass
$19.78
Vintage slag glass lighter or lamp re wired works made by Vidrio
Vintage slag glass lighter or lamp re wired works made by Vidrio
$35.00
Triangular slag glass ashtray with brass pen holder and deco statue by Houze
Triangular slag glass ashtray with brass pen holder and deco statue by Houze
$45.00
Blue slag glass Anchor Hocking cow on a wash tub
Blue slag glass Anchor Hocking cow on a wash tub
$14.75
WESTMORELAND PURPLE SLAG GLASS EAGLE COVERED DISH BOX BASKETWEAVE NEST
WESTMORELAND PURPLE SLAG GLASS EAGLE COVERED DISH BOX BASKETWEAVE NEST
$169.99
Imperial Caramel Slag 43938 Sittin Duck Figure
Imperial Caramel Slag 43938 Sittin Duck Figure
$39.99
Fenton Chocolate Glass Caramel Slag Donkey  Cart Made For FAGCA MIB
Fenton Chocolate Glass Caramel Slag Donkey Cart Made For FAGCA MIB
$130.00
Akro Agate Vaseline Oxblood Slag Glass Playing Card Suits Bridge Nut Dishes
Akro Agate Vaseline Oxblood Slag Glass Playing Card Suits Bridge Nut Dishes
$50.40
VINTAGE VIKING ORANGE SLAG GLASS 135 TALL PEDESTAL VASE HAND SWUNG STRETCH
VINTAGE VIKING ORANGE SLAG GLASS 135 TALL PEDESTAL VASE HAND SWUNG STRETCH
$32.50
Vintage Boyd Gold Slag Glass Hobo  Dark Green Duck Good Marks
Vintage Boyd Gold Slag Glass Hobo Dark Green Duck Good Marks
$6.50
Vintage Westmoreland Purple Slag Glass Hen On Nest
Vintage Westmoreland Purple Slag Glass Hen On Nest
$35.00
Vintage Akro Agate Orange  White Slag Planter
Vintage Akro Agate Orange White Slag Planter
$9.76
Old Purple Slag Glass Master Salt
Old Purple Slag Glass Master Salt
$9.99
OPAQUE BITTERSWEET ORANGE SLAG GLASS COMPOTE FOOTED CANDY DISH RETRO 5 3 4 HIGH
OPAQUE BITTERSWEET ORANGE SLAG GLASS COMPOTE FOOTED CANDY DISH RETRO 5 3 4 HIGH
$19.20
Vintage Boyd Glass Tug Boat made from gray and white SLAG glass Very Cute
Vintage Boyd Glass Tug Boat made from gray and white SLAG glass Very Cute
$2.99
Fenton Blue  White Marble Slag Glass Rose Ruffled Compote Pedestal Candy Dish
Fenton Blue White Marble Slag Glass Rose Ruffled Compote Pedestal Candy Dish
$6.99
St Clair Tan Brown Slag Glass Banded Holly Beaded Toothpick Holder FREE USA SHIP
St Clair Tan Brown Slag Glass Banded Holly Beaded Toothpick Holder FREE USA SHIP
$10.56
Green Vaseline glass sea shell starfish uranium yellow paperweight milk slag art
Green Vaseline glass sea shell starfish uranium yellow paperweight milk slag art
$3.99
GREEN slag Vaseline glass Kewpie cupie doll uranium girl figurine child slag art
GREEN slag Vaseline glass Kewpie cupie doll uranium girl figurine child slag art
$5.99
Northwood EAPG Scroll With Acanthus Light Purple Slag Glass Toothpick Holder
Northwood EAPG Scroll With Acanthus Light Purple Slag Glass Toothpick Holder
$39.00
Imperial Glass Animal Caramel Slag No19 Marmota Sentinel Woodchuck Figurine
Imperial Glass Animal Caramel Slag No19 Marmota Sentinel Woodchuck Figurine
$67.50
USA SLAG GLASS Green White LILY Vase Urn SIGNED Wings Akro Agate Tulip Daffodil
USA SLAG GLASS Green White LILY Vase Urn SIGNED Wings Akro Agate Tulip Daffodil
$8.95
Akro Agate Blue Slag Glass Opaque Vase or Planter Vase USA
Akro Agate Blue Slag Glass Opaque Vase or Planter Vase USA
$12.95
Vtg 1940s Mexicali Akro Agate Dresser Jar w Mexican Sombrero Lid Slag Glass
Vtg 1940s Mexicali Akro Agate Dresser Jar w Mexican Sombrero Lid Slag Glass
$27.99
Green Vaseline milk slag glass Frog Toad Figurine Paperweight uranium yellow art
Green Vaseline milk slag glass Frog Toad Figurine Paperweight uranium yellow art
$4.99
Mosser Glass Chocolate Slag DONKEY MULE with Hat Retired
Mosser Glass Chocolate Slag DONKEY MULE with Hat Retired
$42.95
Fenton CAT STYLZ Chameleon Green Slag IRISH SHAMROCKS OOAK FREEusaS
Fenton CAT STYLZ Chameleon Green Slag IRISH SHAMROCKS OOAK FREEusaS
$260.39
IMPERIAL GLASS RED SATIN SLAG EAGLE GOBLET CUP
IMPERIAL GLASS RED SATIN SLAG EAGLE GOBLET CUP
$15.00
Vintage Imperial Caramel Slag Footed Glass Rose Bowl
Vintage Imperial Caramel Slag Footed Glass Rose Bowl
$34.99
Blue slag Vaseline solid art glass Frog Toad Figurine Paperweight uranium marble
Blue slag Vaseline solid art glass Frog Toad Figurine Paperweight uranium marble
$4.99
Blue Vaseline glass sea shell starfish uranium yellow paperweight milk slag art
Blue Vaseline glass sea shell starfish uranium yellow paperweight milk slag art
$5.50
Lovely Rare Vtg Westmoreland Lamb Sheep On Nest Blue Slag Marble Milk Glass Dish
Lovely Rare Vtg Westmoreland Lamb Sheep On Nest Blue Slag Marble Milk Glass Dish
$65.00


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