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:

VINTAGE BENNETT CAMBRIDGE BLUE SLAG GLASS INVERTED STRAWBERRY TOOTHPICK HOLDER
VINTAGE BENNETT CAMBRIDGE BLUE SLAG GLASS INVERTED STRAWBERRY TOOTHPICK HOLDER
$14.99
RARE WESTMORELAND BLUE SLAG CAT W STUNNING BLUE EYES ON LACE EDGE BASKET
RARE WESTMORELAND BLUE SLAG CAT W STUNNING BLUE EYES ON LACE EDGE BASKET
$145.99
Toothpick Holder Blue Slag Glass Cornucopia Design
Toothpick Holder Blue Slag Glass Cornucopia Design
$4.99
WESTMORELAND GLASS PURPLE SLAG MARBLE LION BASKET CANDY DISH CAT
WESTMORELAND GLASS PURPLE SLAG MARBLE LION BASKET CANDY DISH CAT
$64.49
Vintage Mosser Glass Josh Figurine Royal Lustre Rare Purple Slag
Vintage Mosser Glass Josh Figurine Royal Lustre Rare Purple Slag
$7.99
FENTON ART DECO STYLE BLUE SLAG GLASS SHOE  CAT NM CONDITION W ORIG STICKER
FENTON ART DECO STYLE BLUE SLAG GLASS SHOE CAT NM CONDITION W ORIG STICKER
$20.99
ANTIQUE RARE LOT OF THREE Slag Caramel Bird on Vine Cups EXCELLENT CONDITION
ANTIQUE RARE LOT OF THREE Slag Caramel Bird on Vine Cups EXCELLENT CONDITION
$59.99
Antique Lot Of Two Greentown Indiana Chocolate Caramel Slag Glass Coffee Cup
Antique Lot Of Two Greentown Indiana Chocolate Caramel Slag Glass Coffee Cup
$32.99
Kanawha Art Glass Hobstar Red Slag Glass Luxury STAR SCALLOP BOWL 65
Kanawha Art Glass Hobstar Red Slag Glass Luxury STAR SCALLOP BOWL 65
$36.00
Fenton Butter Dish Covered Lidded Slag Chocolate Glass Button Arches
Fenton Butter Dish Covered Lidded Slag Chocolate Glass Button Arches
$83.98
Set Imperial Glass Purple Slag Owl Sugar And Creamer Label
Set Imperial Glass Purple Slag Owl Sugar And Creamer Label
$15.00
Fenton Art Glass Chocolate Slag Rose Covered Candy Jar Box Dish Butterfly
Fenton Art Glass Chocolate Slag Rose Covered Candy Jar Box Dish Butterfly
$200.00
Vintage 1981 Mosser Glass Bimbah Elephant Figurine Trunk Up Grey Slag Glass
Vintage 1981 Mosser Glass Bimbah Elephant Figurine Trunk Up Grey Slag Glass
$11.97
FENTON PERIWINKLE SLAG FISH BOWL
FENTON PERIWINKLE SLAG FISH BOWL
$75.00
FENTON CHOCOLATE SLAG FOUR FATHERS PLANTER
FENTON CHOCOLATE SLAG FOUR FATHERS PLANTER
$20.00
FENTON PERIWINKLE SLAG 1935 MACAROON JAR
FENTON PERIWINKLE SLAG 1935 MACAROON JAR
$45.00
FENTON PERIWINKLE SLAG CORNUCOPIA SIGNED NANCY FENTON
FENTON PERIWINKLE SLAG CORNUCOPIA SIGNED NANCY FENTON
$25.00
FENTON CHOCOLATE SLAG NFGS DUCKLING ARTIST SIGNED AND DATED 2006 2007
FENTON CHOCOLATE SLAG NFGS DUCKLING ARTIST SIGNED AND DATED 2006 2007
$45.00
FENTON PERIWINKLE SLAG DOLPHIN COMPOTE
FENTON PERIWINKLE SLAG DOLPHIN COMPOTE
$40.00
FENTON PERIWINKLE SLAG HAND PAINTED PATRIOTIC HAPPY CAT SIGN KATHLEEN SPONSLER
FENTON PERIWINKLE SLAG HAND PAINTED PATRIOTIC HAPPY CAT SIGN KATHLEEN SPONSLER
$150.00
FENTON PERIWINKLE SLAG URN VASE
FENTON PERIWINKLE SLAG URN VASE
$45.00
FENTON PERIWINKLE SLAG CACTUS BISCUIT JAR MARKED FFOGKC 2005 100th ANIVERSARY
FENTON PERIWINKLE SLAG CACTUS BISCUIT JAR MARKED FFOGKC 2005 100th ANIVERSARY
$135.00
FENTON PERIWINKLE SLAG GLOSSY ALLEY CAT
FENTON PERIWINKLE SLAG GLOSSY ALLEY CAT
$100.00
FENTON PERIWINKLE SLAG FAN VASE
FENTON PERIWINKLE SLAG FAN VASE
$40.00
FENTON PERIWINKLE SLAG EPERGNE HORN AND BOWL SET
FENTON PERIWINKLE SLAG EPERGNE HORN AND BOWL SET
$100.00
Antique GREENTOWN Glass CACTUS Chocolate Slag Compote 525 x 55 Tall c1900
Antique GREENTOWN Glass CACTUS Chocolate Slag Compote 525 x 55 Tall c1900
$35.00
Rare Vintage Fenton Art Colonial Royal Blue Slag Milk Glass Candlestick Holder
Rare Vintage Fenton Art Colonial Royal Blue Slag Milk Glass Candlestick Holder
$28.50
Heisey Clear And Carmel Slag Imperial HCA Standing Colts
Heisey Clear And Carmel Slag Imperial HCA Standing Colts
$40.99
Vintage Akro Glass Pink Orange Slag Glass Leaf Dish Ashtray Marbled
Vintage Akro Glass Pink Orange Slag Glass Leaf Dish Ashtray Marbled
$4.50
Imperial End of Day Slag Caramel Bird on Vine IG Cup 1454
Imperial End of Day Slag Caramel Bird on Vine IG Cup 1454
$32.99
Vintage Westmoreland Cat On Basket Covered Candy Trinket Dish Blue Slag Glass
Vintage Westmoreland Cat On Basket Covered Candy Trinket Dish Blue Slag Glass
$19.95
Vintage Amber Slag Glass Standing Indian Chef
Vintage Amber Slag Glass Standing Indian Chef
$20.00
Vintage Milk Green Slag Glass Colonial Lady Powder Jar Base Akro Agate
Vintage Milk Green Slag Glass Colonial Lady Powder Jar Base Akro Agate
$15.00
VINTAGE IMPERIAL HEISEY MOLD ELEPHANT CARAMEL SLAG LABELS
VINTAGE IMPERIAL HEISEY MOLD ELEPHANT CARAMEL SLAG LABELS
$45.00
VINTAGE IMPERIAL HEISEY MOLD CHAMP TERRIER CARAMEL SLAG LABELS
VINTAGE IMPERIAL HEISEY MOLD CHAMP TERRIER CARAMEL SLAG LABELS
$75.00
Clear Hen chicken On A Nest Slag Glass N MINT
Clear Hen chicken On A Nest Slag Glass N MINT
$8.00
Fenton Satin Caramel Chocolate Yellow Slag Alley Cat
Fenton Satin Caramel Chocolate Yellow Slag Alley Cat
$135.00
Fenton Glossy Caramel Chocolate Yellow Slag Alley Cat
Fenton Glossy Caramel Chocolate Yellow Slag Alley Cat
$135.00
Antique Cactus Pattern Caramel Chocolate Slag Biscuit Jar w Lid
Antique Cactus Pattern Caramel Chocolate Slag Biscuit Jar w Lid
$29.99
Fenton Blue Marble Blue  White Slag Glass Grape  Cable Tobacco Jar NO LID 600
Fenton Blue Marble Blue White Slag Glass Grape Cable Tobacco Jar NO LID 600
$24.99


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