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:

FENTON CAMEO Glass CARVED Chocolate SLAG SEA LIFE Childs TUMBLERS PLATTER Set
FENTON CAMEO Glass CARVED Chocolate SLAG SEA LIFE Childs TUMBLERS PLATTER Set
$262.50
Mosser Slag Art Glass The Performer Clown on a Barrel 1982 Poko Iridescent Blue
Mosser Slag Art Glass The Performer Clown on a Barrel 1982 Poko Iridescent Blue
$3.00
VINTAGE KANAWHA GLASS ORANGE YELLOW SLAG SMALL PITCHER GLASS 4 HIGH
VINTAGE KANAWHA GLASS ORANGE YELLOW SLAG SMALL PITCHER GLASS 4 HIGH
$7.99
BOYD GLASS ELEPHANT HEAD TOOTHPICK PERSIMMON ORANGE SLAG B IN DIAMOND
BOYD GLASS ELEPHANT HEAD TOOTHPICK PERSIMMON ORANGE SLAG B IN DIAMOND
$9.99
BOYD GLASS ELEPHANT HEAD TOOTHPICK HOLDER CARAMEL BROWN SLAG
BOYD GLASS ELEPHANT HEAD TOOTHPICK HOLDER CARAMEL BROWN SLAG
$9.99
BOYD GLASS JOEY THE HORSE ORANGE GREEN SLAG B IN DIAMOND NO LINES
BOYD GLASS JOEY THE HORSE ORANGE GREEN SLAG B IN DIAMOND NO LINES
$46.74
Vintage Large Westmoreland Purple and White Slag Marble Vase 17 1 2 Inches Tall
Vintage Large Westmoreland Purple and White Slag Marble Vase 17 1 2 Inches Tall
$59.00
VINTAGE BOYD GLASS ORANGE SPICE GREEN SLAG PATRICK BALLOON TEDDY BEAR FIGURINE
VINTAGE BOYD GLASS ORANGE SPICE GREEN SLAG PATRICK BALLOON TEDDY BEAR FIGURINE
$4.24
VINTAGE BOYD GLASS ORANGE SPICE TAN SLAG PATRICK BALLOON TEDDY BEAR FIGURINE
VINTAGE BOYD GLASS ORANGE SPICE TAN SLAG PATRICK BALLOON TEDDY BEAR FIGURINE
$4.24
VINTAGE BOYD GLASS DARK NILE GREEN SLAG PATRICK BALLOON TEDDY BEAR FIGURINE
VINTAGE BOYD GLASS DARK NILE GREEN SLAG PATRICK BALLOON TEDDY BEAR FIGURINE
$4.24
VINTAGE BOYD GLASS ORANGE SPICE SLAG PATRICK BALLOON TEDDY BEAR FIGURINE
VINTAGE BOYD GLASS ORANGE SPICE SLAG PATRICK BALLOON TEDDY BEAR FIGURINE
$4.24
BOYD ART GLASS ZACK THE ELEPHANT LIGHT LAVENDER OPAQUE SLAG GLASS PAPERWEIGHT PW
BOYD ART GLASS ZACK THE ELEPHANT LIGHT LAVENDER OPAQUE SLAG GLASS PAPERWEIGHT PW
$21.99
McKee Fluer de lis Chocolate slag glass tumbler Antique early 1900s
McKee Fluer de lis Chocolate slag glass tumbler Antique early 1900s
$48.00
Vintage Greentown St Clair Chocolate Slag Glass Tumbler Cactus Flower Pattern
Vintage Greentown St Clair Chocolate Slag Glass Tumbler Cactus Flower Pattern
$28.76
Summit Art Glass Fierce Translucent Red Holly Pattern Tumbler
Summit Art Glass Fierce Translucent Red Holly Pattern Tumbler
$2.00
FENTON 1125 ALLEY CAT PERIWINKLE BLUE SLAG GLASS W BOX
FENTON 1125 ALLEY CAT PERIWINKLE BLUE SLAG GLASS W BOX
$35.00
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
Imperial Glass Caramel Slag Windmill Pattern Bowl Ruffled edge Doeskin
Imperial Glass Caramel Slag Windmill Pattern Bowl Ruffled edge Doeskin
$30.00
Vtg Slag Glass Pitcher Vibrant OrangeYellow  White Kanawha Dunbar Art Glas
Vtg Slag Glass Pitcher Vibrant OrangeYellow White Kanawha Dunbar Art Glas
$8.50
VINTAGE GREEN SLAG GLASS TRINKET DISH PLANTER USA
VINTAGE GREEN SLAG GLASS TRINKET DISH PLANTER USA
$4.99
Slag Glass Lighthouse Purple Ruby Red Sun Catcher Hand Made
Slag Glass Lighthouse Purple Ruby Red Sun Catcher Hand Made
$19.99
Vintage Slag Button and Daisy Ladies Boot
Vintage Slag Button and Daisy Ladies Boot
$4.00
2 IMPERIAL GLASS Amethyst Purple Slag Grid  Flowers Vases 5
2 IMPERIAL GLASS Amethyst Purple Slag Grid Flowers Vases 5
$14.99
Ornate Vintage Brown Swirls Streaking Over White Slag Glass Bowl
Ornate Vintage Brown Swirls Streaking Over White Slag Glass Bowl
$27.86
Imperial Glass Vintage Toothpick Holder Pink and White Slag
Imperial Glass Vintage Toothpick Holder Pink and White Slag
$9.00
Imperial Glass Vintage Toothpick Holder Red and White Slag
Imperial Glass Vintage Toothpick Holder Red and White Slag
$9.00
Imperial Caramel Slag 43938 Sittin Duck Figure
Imperial Caramel Slag 43938 Sittin Duck Figure
$39.99
Toothpick Holder Unknown Pattern Ruby Stained
Toothpick Holder Unknown Pattern Ruby Stained
$9.50
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 6 ROLFE Hand Blown Studio Slag Marble Art Glass Vase
Vintage 6 ROLFE Hand Blown Studio Slag Marble Art Glass Vase
$45.00
Toothpick Holder Bulging Loops Pigeon Blood
Toothpick Holder Bulging Loops Pigeon Blood
$59.50
Vintage Fenton OOAK Opalescent Slag Glass Bear HP and Signed By DJohnson
Vintage Fenton OOAK Opalescent Slag Glass Bear HP and Signed By DJohnson
$29.99
Toothpick Holder Rs Prussia Mold 501 Wheelock Trade Mark
Toothpick Holder Rs Prussia Mold 501 Wheelock Trade Mark
$59.50
Toothpick Holder Rs Prussia Mold 542 Rare
Toothpick Holder Rs Prussia Mold 542 Rare
$9.50
Vintage Boyd Gold Slag Glass Hobo  Dark Green Duck Good Marks
Vintage Boyd Gold Slag Glass Hobo Dark Green Duck Good Marks
$7.50
Fenton Blue Swirl Slag Cabbage Rose Pattern Candy Bowl Dish Footed Compote
Fenton Blue Swirl Slag Cabbage Rose Pattern Candy Bowl Dish Footed Compote
$16.00
EARLY Fenton Mandarin Red Slag 2007 Shallow Cupped Bowl 9 1 2 Wide 2 Tall
EARLY Fenton Mandarin Red Slag 2007 Shallow Cupped Bowl 9 1 2 Wide 2 Tall
$74.99
Toothpick Holder Epb Cut Glass Signed Fry
Toothpick Holder Epb Cut Glass Signed Fry
$129.50
Toothpick Holder Epb Cut Glass Tuthills Prim Rose Pattern Unsigned
Toothpick Holder Epb Cut Glass Tuthills Prim Rose Pattern Unsigned
$129.50
Beautiful Estate Vintage Imperial Art Glass Basket Ruby Slag 5 1 2
Beautiful Estate Vintage Imperial Art Glass Basket Ruby Slag 5 1 2
$19.99


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