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:

KANAWHA GLASS PAIR LITTLE SLAG GLASS BASKETS LIME WHITE AND AQUA WHITE CUTE
KANAWHA GLASS PAIR LITTLE SLAG GLASS BASKETS LIME WHITE AND AQUA WHITE CUTE
$25.00
Fenton BRIDESMAID REDUCED Chocolate Slag PURE IVORY NATURE Floral OOAK FreeUSAsh
Fenton BRIDESMAID REDUCED Chocolate Slag PURE IVORY NATURE Floral OOAK FreeUSAsh
$256.49
Fenton BUNNY PLUM SLAG w BLUE IRIS GARDEN OOAK FREEusaSHIP
Fenton BUNNY PLUM SLAG w BLUE IRIS GARDEN OOAK FREEusaSHIP
$303.99
Fenton BUNNY LOP EARRED Chocolate Slag SARAH LEE OOAK FREEusaSHIP
Fenton BUNNY LOP EARRED Chocolate Slag SARAH LEE OOAK FREEusaSHIP
$180.49
Fenton Collectibles CAT Stylz Black Slag Pansy Collage OOAK FREEusaSHIP
Fenton Collectibles CAT Stylz Black Slag Pansy Collage OOAK FREEusaSHIP
$284.99
Fenton CAT Violet Slag Irid BUTTERFLIES  SOFT VIOLETS OOAK FREEusaSHIP
Fenton CAT Violet Slag Irid BUTTERFLIES SOFT VIOLETS OOAK FREEusaSHIP
$237.49
Fenton CAT BLOWN Cranberry  Pink Slag SLVR Mica FETTY TTC Exc OOAK freeUSAship
Fenton CAT BLOWN Cranberry Pink Slag SLVR Mica FETTY TTC Exc OOAK freeUSAship
$246.99
Fenton CAT STYLIZED Violet Slag Iridescent PASTEL FLORAL OOAK FREEusaSH
Fenton CAT STYLIZED Violet Slag Iridescent PASTEL FLORAL OOAK FREEusaSH
$284.99
IMPERIAL ART GLASS CARMEL SLAG TOOTHPICK HOLDER DOESKIN SATIN MARKED
IMPERIAL ART GLASS CARMEL SLAG TOOTHPICK HOLDER DOESKIN SATIN MARKED
$9.99
Vintage Imperial Chocolate Caramel Slag Art Glass Cruet
Vintage Imperial Chocolate Caramel Slag Art Glass Cruet
$24.99
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
Pink rose milk slag glass serving honey pot bee hive pattern jar dish marble nr
Pink rose milk slag glass serving honey pot bee hive pattern jar dish marble nr
$13.99
OSHKOSH WISCONSIN 1979 AIRPLANEROUND SLAG GLASS DISKAVIATION
OSHKOSH WISCONSIN 1979 AIRPLANEROUND SLAG GLASS DISKAVIATION
$10.50
Vintage LE Smith Glass Swung Vase Simplicity Bittersweet Orange Slag 25 5 8 T
Vintage LE Smith Glass Swung Vase Simplicity Bittersweet Orange Slag 25 5 8 T
$90.00
Vintage Greentown Chocolate Slag Glass Covered Butter Dish Cactus
Vintage Greentown Chocolate Slag Glass Covered Butter Dish Cactus
$45.00
Slag Glass Specimens Display Piece Decor Aquarium Decoration 2 lbs 8 oz
Slag Glass Specimens Display Piece Decor Aquarium Decoration 2 lbs 8 oz
$15.00
Mid Century SLAG GLASS candy dish and drink coasters 1960s brass panel brown
Mid Century SLAG GLASS candy dish and drink coasters 1960s brass panel brown
$17.99
IMPERIAL PURPLE SLAG GLASS PEDESTAL LIDDED DISH WITH EAGLE
IMPERIAL PURPLE SLAG GLASS PEDESTAL LIDDED DISH WITH EAGLE
$553.86
LiveTarget Lures Frog Popper FGP65T503
LiveTarget Lures Frog Popper FGP65T503
$12.50
LiveTarget Lures Frog Hollow Body FGH45T508
LiveTarget Lures Frog Hollow Body FGH45T508
$12.10
LiveTarget Lures Frog Hollow Body FGH45T501
LiveTarget Lures Frog Hollow Body FGH45T501
$12.10
Two Vtg Akro Agate Green  White Swirled Slag Glass Planters Stepped Layers USA
Two Vtg Akro Agate Green White Swirled Slag Glass Planters Stepped Layers USA
$43.50
LiveTarget Lures Frog Hollow Body FGH45T500
LiveTarget Lures Frog Hollow Body FGH45T500
$12.10
Westmoreland Imperial Purple Amethyst Marble Slag Glass Bowl Candy Dish
Westmoreland Imperial Purple Amethyst Marble Slag Glass Bowl Candy Dish
$29.99
Vintage Westmoreland Glass Purple Slag Glass 2 Handle Sweetmeat Compote
Vintage Westmoreland Glass Purple Slag Glass 2 Handle Sweetmeat Compote
$25.00
VINTAGE PURPLE SLAG SMALL PITCHER CIRCA 1850
VINTAGE PURPLE SLAG SMALL PITCHER CIRCA 1850
$8.00
VINTAGE MINI SLAG GLASS VASE 3 1 4 TALL
VINTAGE MINI SLAG GLASS VASE 3 1 4 TALL
$2.99
VINTAGE SLAG GLASS GOBLET WITH STARS
VINTAGE SLAG GLASS GOBLET WITH STARS
$5.99
imperial Glass Lion on Nest Covered Dish Purple Slag Early American Pressed 1899
imperial Glass Lion on Nest Covered Dish Purple Slag Early American Pressed 1899
$134.99
MosserGlassSlagJiggsAll the World Loves A ClownArt
MosserGlassSlagJiggsAll the World Loves A ClownArt
$12.95
green slag vase
green slag vase
$14.99
Pink and White Decorative Slag Glass Pieces Three 3
Pink and White Decorative Slag Glass Pieces Three 3
$10.00
Bournique Glass Co Caramel Slag 105 Swung Vase c1907 1926
Bournique Glass Co Caramel Slag 105 Swung Vase c1907 1926
$49.99
FENTON CHOCOLATE SLAG FANTAIL BUTTERFLY  BERRY 10 1 4 DBS CAKE PLATE 3 TOED
FENTON CHOCOLATE SLAG FANTAIL BUTTERFLY BERRY 10 1 4 DBS CAKE PLATE 3 TOED
$101.99
1890 RARE Cobalt Slag Glass Floral 3 pc Garniture Console Mantle Set Silver Wire
1890 RARE Cobalt Slag Glass Floral 3 pc Garniture Console Mantle Set Silver Wire
$475.00
1 vintage FENTON Blue White SLAG GLASS Compote STEMMED BOWL Pattern
1 vintage FENTON Blue White SLAG GLASS Compote STEMMED BOWL Pattern
$29.95
Rare Fenton Chameleon Green Slag Deer Special Order Rosso
Rare Fenton Chameleon Green Slag Deer Special Order Rosso
$65.00
Fenton FROG Chocolate Slag Satin SHORELINE SHELLS OOAK FREEusaSHIP
Fenton FROG Chocolate Slag Satin SHORELINE SHELLS OOAK FREEusaSHIP
$299.99
FENTON LOGO SIGN Chameleon Green Slag RECTANGLE 9799XE FREE USA SHIP
FENTON LOGO SIGN Chameleon Green Slag RECTANGLE 9799XE FREE USA SHIP
$118.74
Fenton MOUSE NFGS 2007 EXCLUSIVE C Riggs PERIWINKLE SLAG CLOWN FREE USA SHIP
Fenton MOUSE NFGS 2007 EXCLUSIVE C Riggs PERIWINKLE SLAG CLOWN FREE USA SHIP
$94.52


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