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:

Chocolate slag glass tomahawk Mosser Glass for Degenhart museum
Chocolate slag glass tomahawk Mosser Glass for Degenhart museum
$12.99
Fenton BUNNY PLUM SLAG w BLUE IRIS GARDEN OOAK FREEusaSHIP
Fenton BUNNY PLUM SLAG w BLUE IRIS GARDEN OOAK FREEusaSHIP
$303.99
VINTAGE BOYD USA MADE COLOR CARMINE SLAG HEART TRINKET BOX DATED 10 78
VINTAGE BOYD USA MADE COLOR CARMINE SLAG HEART TRINKET BOX DATED 10 78
$20.00
akro agate blue slag glass ashtray art deco short tab ashtray
akro agate blue slag glass ashtray art deco short tab ashtray
$22.35
Fenton Slag Glass American Bicentennial Eagle Paperweight  228 1 MKTJB
Fenton Slag Glass American Bicentennial Eagle Paperweight 228 1 MKTJB
$10.00
Slag Glass figurine Jenny by Vi Hunter from Mosser Glass Co
Slag Glass figurine Jenny by Vi Hunter from Mosser Glass Co
$14.00
Slag Glass figurine Jenny by Vi Hunter from Mosser Glass Co
Slag Glass figurine Jenny by Vi Hunter from Mosser Glass Co
$12.00
Kanawha Green White Slag End of Day Moon and Stars Compote Candy Dish
Kanawha Green White Slag End of Day Moon and Stars Compote Candy Dish
$12.99
Mosser JOSH  JENNY Purple Slag Glass Figurines By Vi Hunter
Mosser JOSH JENNY Purple Slag Glass Figurines By Vi Hunter
$42.95
1907 1926 Bournique Blue Slag Art Glass Vase 10 Vintage
1907 1926 Bournique Blue Slag Art Glass Vase 10 Vintage
$35.00
ORANGE AND WHITE SLAG GLASS HOBNAIL RUFFLED RIM COMPOTE 3 3 4 T X 6 W GORGEOUS
ORANGE AND WHITE SLAG GLASS HOBNAIL RUFFLED RIM COMPOTE 3 3 4 T X 6 W GORGEOUS
$11.50
Vintage BLUE slag GUERNSEY Glass ROCKY rocking horse 3 1982
Vintage BLUE slag GUERNSEY Glass ROCKY rocking horse 3 1982
$14.99
RARE Chocolate Slag Glass LG Wright or Indiana Miniature Stove Honey Dish
RARE Chocolate Slag Glass LG Wright or Indiana Miniature Stove Honey Dish
$29.99
Rare Riviere Studios NY Bronze Slag Glass Box Signed Early 20th cent 6 7 8
Rare Riviere Studios NY Bronze Slag Glass Box Signed Early 20th cent 6 7 8
$395.00
Basket Blue White Swirl Slag Glass Hobnail Ruffled Rim
Basket Blue White Swirl Slag Glass Hobnail Ruffled Rim
$15.00
Fenton BicentennialChocolate Slag Collector Plate Daniel Webster Quote on Back
Fenton BicentennialChocolate Slag Collector Plate Daniel Webster Quote on Back
$5.99
Berkley Flicker Minnow 1373155
Berkley Flicker Minnow 1373155
$7.70
VINTAGE 1939 AKRO AGATE CHILDS TEA POT CREAMER TURQUOISE BLUE SLAG GLASS 1
VINTAGE 1939 AKRO AGATE CHILDS TEA POT CREAMER TURQUOISE BLUE SLAG GLASS 1
$6.99
VINTAGE 1939 AKRO AGATE CHILDS TEA POT CREAMER TRUE BLUE SLAG GLASS 4
VINTAGE 1939 AKRO AGATE CHILDS TEA POT CREAMER TRUE BLUE SLAG GLASS 4
$6.99
VINTAGE 1939 AKRO AGATE 3 PC CHILDS TEA SET ALL YELLOW MARBLE SLAG GLASS
VINTAGE 1939 AKRO AGATE 3 PC CHILDS TEA SET ALL YELLOW MARBLE SLAG GLASS
$9.99
VINTAGE 1939 AKRO AGATE CHILDS TEA POT CREAMER TRUE BLUE SLAG GLASS 3
VINTAGE 1939 AKRO AGATE CHILDS TEA POT CREAMER TRUE BLUE SLAG GLASS 3
$6.99
VINTAGE 1939 AKRO AGATE 6 PC CHILD PLATES ALL YELLOW GOLDENROD MARBLE SLAG GLASS
VINTAGE 1939 AKRO AGATE 6 PC CHILD PLATES ALL YELLOW GOLDENROD MARBLE SLAG GLASS
$9.99
VTG 1939 AKRO AGATE 12 PC CHILDS TEA SET GREEN MARBLE SLAG GLASS ESPRESSO SET
VTG 1939 AKRO AGATE 12 PC CHILDS TEA SET GREEN MARBLE SLAG GLASS ESPRESSO SET
$69.99
VINTAGE 1939 AKRO AGATE 10 PC CHILDS TEA SET BLUE GREEN YELLOW MARBLE SLAG GLASS
VINTAGE 1939 AKRO AGATE 10 PC CHILDS TEA SET BLUE GREEN YELLOW MARBLE SLAG GLASS
$31.99
VINTAGE 1939 AKRO AGATE 3 PC CHILDS TEA SET CLEAR GREEN MARBLE SLAG GLASS 2
VINTAGE 1939 AKRO AGATE 3 PC CHILDS TEA SET CLEAR GREEN MARBLE SLAG GLASS 2
$9.99
VINTAGE 1939 AKRO AGATE CHILDS TEA POT CREAMER TURQUOISE BLUE SLAG GLASS 2
VINTAGE 1939 AKRO AGATE CHILDS TEA POT CREAMER TURQUOISE BLUE SLAG GLASS 2
$6.99
VTG 1939 AKRO AGATE 8 PC CHILDS TEA SET GREEN TURQUOISE SLAG GLASS ESPRESSO SET
VTG 1939 AKRO AGATE 8 PC CHILDS TEA SET GREEN TURQUOISE SLAG GLASS ESPRESSO SET
$44.99
VINTAGE 1939 AKRO AGATE 5 PC CHILDS TEA SET ALL VANILLA MARBLE SLAG GLASS
VINTAGE 1939 AKRO AGATE 5 PC CHILDS TEA SET ALL VANILLA MARBLE SLAG GLASS
$16.99
VINTAGE 1939 AKRO AGATE 6 PC CHILDS TEA SET GOLD  TOFFEE MARBLE SLAG GLASS
VINTAGE 1939 AKRO AGATE 6 PC CHILDS TEA SET GOLD TOFFEE MARBLE SLAG GLASS
$17.99
70S FENTON ROSALENE PINK SLAG SWAN 5 CANDY DISH WITH LABEL FENTON MARK
70S FENTON ROSALENE PINK SLAG SWAN 5 CANDY DISH WITH LABEL FENTON MARK
$12.99
Degenhart Glass Childs Mug in Chocolate Slag  Maybe Dark Amber
Degenhart Glass Childs Mug in Chocolate Slag Maybe Dark Amber
$11.99
Northwood Mosaic purple slag Ring Handled Basket ca 1903 Extremely Rare
Northwood Mosaic purple slag Ring Handled Basket ca 1903 Extremely Rare
$250.00
Vintage Caramel Slag Glass Pedestal Compote Diamond Point Pattern Scalloped Top
Vintage Caramel Slag Glass Pedestal Compote Diamond Point Pattern Scalloped Top
$9.99
Fenton Blue Slag Rose Pattern Compote Candy Dish 75 Tall
Fenton Blue Slag Rose Pattern Compote Candy Dish 75 Tall
$33.96
Northwood Mosaic Purple Slag Jack in the Pulpit Vase ca 1903
Northwood Mosaic Purple Slag Jack in the Pulpit Vase ca 1903
$125.00
Berkley Bad Shad 2 3 4 Length Brown Mustard Per 1 1375370
Berkley Bad Shad 2 3 4 Length Brown Mustard Per 1 1375370
$8.80
Northwood Mosaic Purple Slag Jack in the Pulpit Vase ca 1903
Northwood Mosaic Purple Slag Jack in the Pulpit Vase ca 1903
$125.00
Pair of Iridescent Fruit Form Art Glass Paperweights Mexico Slag Glass
Pair of Iridescent Fruit Form Art Glass Paperweights Mexico Slag Glass
$50.00
BEAUTIFUL VINTAGE FENTON WHITE SLAG HOBNAIL GLASS SHOE TRINKET DISH W LID
BEAUTIFUL VINTAGE FENTON WHITE SLAG HOBNAIL GLASS SHOE TRINKET DISH W LID
$19.95
Northwood Mosaic Purple Slag Floralore Novelty Bowl ca 1903
Northwood Mosaic Purple Slag Floralore Novelty Bowl ca 1903
$85.00


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