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:

Imperial Caramel Slag Set of 4 pieces
Imperial Caramel Slag Set of 4 pieces
$25.99
IMPERIAL IG GLASS CARAMEL SLAG SADDLE ZIPPER COMPOTE DISH BOWL 48 2
IMPERIAL IG GLASS CARAMEL SLAG SADDLE ZIPPER COMPOTE DISH BOWL 48 2
$21.99
Imperial Set of 3 pieces Plus Beautiful Alabaster Caramel Slag Owl Paperweight
Imperial Set of 3 pieces Plus Beautiful Alabaster Caramel Slag Owl Paperweight
$25.99
FENTON HOBNAIL BLUE SLAG ALMOST HEAVEN CANDLE STICKS HOLDERS RAREa
FENTON HOBNAIL BLUE SLAG ALMOST HEAVEN CANDLE STICKS HOLDERS RAREa
$49.99
Akro Agate Orange Slag Glass Lily Vase 658 Matching Pair Estate Find Vintage
Akro Agate Orange Slag Glass Lily Vase 658 Matching Pair Estate Find Vintage
$29.99
RARE Vintage 80s Fenton Red Slag Deer Fawn Levay Beautiful W Paper Lable
RARE Vintage 80s Fenton Red Slag Deer Fawn Levay Beautiful W Paper Lable
$119.99
DEGENHART BEADED OVAL TOOTHPICK HOLDER  BITTERSWEET SLAG
DEGENHART BEADED OVAL TOOTHPICK HOLDER BITTERSWEET SLAG
$14.99
Imperial Glass Co Red Slag Glass Storybook Mug
Imperial Glass Co Red Slag Glass Storybook Mug
$9.95
Guernsey Bennett Glass Fish Purple Pink Magenta Slag Iridescent Carnival Color
Guernsey Bennett Glass Fish Purple Pink Magenta Slag Iridescent Carnival Color
$12.99
Guernsey Bennett Glass Fish Caramel Slag Color
Guernsey Bennett Glass Fish Caramel Slag Color
$12.99
Slag glass cowboy child boy figure
Slag glass cowboy child boy figure
$17.00
Slag glass cowboy child boy figure
Slag glass cowboy child boy figure
$17.00
Slag glass Indian boy figure
Slag glass Indian boy figure
$17.00
Kanawha Pitcher Creamer Slag End Of Day Glass Dunbar W Va Swirled Colors 5 in
Kanawha Pitcher Creamer Slag End Of Day Glass Dunbar W Va Swirled Colors 5 in
$25.00
Lot of 3 Antique GREENTOWN INDIANA Chocolate Caramel SLAG LEAF BRACKET Fruit Sau
Lot of 3 Antique GREENTOWN INDIANA Chocolate Caramel SLAG LEAF BRACKET Fruit Sau
$29.99
Lot of 3 Antique GREENTOWN INDIANA Chocolate Caramel SLAG Cactus Berry Nappy Bow
Lot of 3 Antique GREENTOWN INDIANA Chocolate Caramel SLAG Cactus Berry Nappy Bow
$62.99
GREENTOWN INDIANA Chocolate Caramel Slag LEAF BRACKET 8 Master Fruit Berry Bowl
GREENTOWN INDIANA Chocolate Caramel Slag LEAF BRACKET 8 Master Fruit Berry Bowl
$62.99
Antique GREENTOWN INDIANA Chocolate Caramel SLAG LEAF BRACKET Relish Celery Dish
Antique GREENTOWN INDIANA Chocolate Caramel SLAG LEAF BRACKET Relish Celery Dish
$37.99
GREENTOWN INDIANA Chocolate Caramel Slag LEAF BRACKET Cream  Open Sugar
GREENTOWN INDIANA Chocolate Caramel Slag LEAF BRACKET Cream Open Sugar
$39.99
Antique GREENTOWN INDIANA Chocolate Caramel SLAG LEAF BRACKET Handled Nappy
Antique GREENTOWN INDIANA Chocolate Caramel SLAG LEAF BRACKET Handled Nappy
$13.99
Pair Vintage AKRO AGATE Slag Glass Marbleized Swirled orange pink CORNUCOPIA
Pair Vintage AKRO AGATE Slag Glass Marbleized Swirled orange pink CORNUCOPIA
$8.91
RARE Tiffany Studios New York 800 Stamp Slag Glass Bronze Pineneedle Desk Box
RARE Tiffany Studios New York 800 Stamp Slag Glass Bronze Pineneedle Desk Box
$600.00
Caramel Brown Slag Glass Footed Toothpick Holder
Caramel Brown Slag Glass Footed Toothpick Holder
$10.00
Art Glass Vase Bottle Amber White Slag Swirl Design 8x 3 1 2 Base 1 1 2 Top
Art Glass Vase Bottle Amber White Slag Swirl Design 8x 3 1 2 Base 1 1 2 Top
$15.00
4 Piece Imperial Glass Caramel Slag Rose Bowl Windmill Pitcher Creamer
4 Piece Imperial Glass Caramel Slag Rose Bowl Windmill Pitcher Creamer
$50.00
LiveTarget Lures Rigged Shrimp Soft Plastic SSF100SK915
LiveTarget Lures Rigged Shrimp Soft Plastic SSF100SK915
$11.90
LiveTarget Lures Yearling Baitball Jerkbait YJB95S815
LiveTarget Lures Yearling Baitball Jerkbait YJB95S815
$12.87
LiveTarget Lures Yellow Perch YPS134MS714
LiveTarget Lures Yellow Perch YPS134MS714
$10.60
LiveTarget Lures Yearling Baitball Walking Bait YWB90T812
LiveTarget Lures Yearling Baitball Walking Bait YWB90T812
$12.87
VIKING 60S AMBERINA ORANGE YELLOW BASE STRETCH SWUNG SLAG GLASS VASE 19 3 4
VIKING 60S AMBERINA ORANGE YELLOW BASE STRETCH SWUNG SLAG GLASS VASE 19 3 4
$39.99
VINTAGE IMPERIAL AGATE SLAG GLASS COVERED ROUND BOX w Lid Outstanding Condition
VINTAGE IMPERIAL AGATE SLAG GLASS COVERED ROUND BOX w Lid Outstanding Condition
$22.90
Fenton Purple Slag Glass Wild Strawberry Toothpick Holder Item 3507
Fenton Purple Slag Glass Wild Strawberry Toothpick Holder Item 3507
$14.99
POWDER BLUE  WHITE swirl slag glass hand formed ruffled depression Finger Vase
POWDER BLUE WHITE swirl slag glass hand formed ruffled depression Finger Vase
$28.00
VINTAGE IMPERIAL SLAG GLASS PURPLE WHITE BLUE EMBOSSED MUG CUP EXCELLENT
VINTAGE IMPERIAL SLAG GLASS PURPLE WHITE BLUE EMBOSSED MUG CUP EXCELLENT
$22.00
Fenton Blue Slag Marble Handkerchief Vase
Fenton Blue Slag Marble Handkerchief Vase
$27.99
EXTREMELY RARE WEISHAR MOON  STAR RED WHITE  BLUE SLAG CHRISTMAS TREE ORNAMENT
EXTREMELY RARE WEISHAR MOON STAR RED WHITE BLUE SLAG CHRISTMAS TREE ORNAMENT
$499.99
Vintage Imperial Slag Glass Mug with Robin Design Beautiful Purple 3 1 2 Tall
Vintage Imperial Slag Glass Mug with Robin Design Beautiful Purple 3 1 2 Tall
$12.50
Vintage 1970s OPAQUE Slag Glass footed toothpick holder Strawberry Kanawha
Vintage 1970s OPAQUE Slag Glass footed toothpick holder Strawberry Kanawha
$5.00
Fenton Atlantis Vase Chocolate Brown Slag Fish Design 100th Anniversary
Fenton Atlantis Vase Chocolate Brown Slag Fish Design 100th Anniversary
$44.99
Fenton FAGCA Red Slag Butterfly Mug
Fenton FAGCA Red Slag Butterfly Mug
$34.99


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white slag glass medium hen on nest paper l, imperial slag red glass tumbler grape 4 tall, westmoreland greenslag paneled grape footed compote crimped edge logo, akro agate slag glass lamp light green amp; brown caramel swirls, 1940s akro agate artdeco slag glass mexicali powder jar amp; lid pickwick cosmetic, vintage cornucopia large clear glass leaves horn of plenty, vintage set of 3 imperial caramel slag glass flying mallards, 15 pieces slag stained glass catholic church window panes arts crafts vintage d, fenton chocolate slag satin cat impression on forehead mold mark see photo, eyebath eye wash cup w schnauzer dog candy corn orange glass



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