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 CHICKEN ON NEST COVERED CANDY DISH
IMPERIAL CARAMEL SLAG CHICKEN ON NEST COVERED CANDY DISH
$49.95
LOT OF 3 Imperial Chocolate Caramel Slag Ducks
LOT OF 3 Imperial Chocolate Caramel Slag Ducks
$35.00
IMPERIAL GLASS CARAMEL SLAG COVERED CANDY DISH
IMPERIAL GLASS CARAMEL SLAG COVERED CANDY DISH
$25.95
Glass Rock Slag Cullet Ruby Red 910 lb Rocks T51 Landscaping Deco Aquarium
Glass Rock Slag Cullet Ruby Red 910 lb Rocks T51 Landscaping Deco Aquarium
$78.00
Glass Rock Slag Cullet Multi Colors 212 lb Rocks T60 Landscaping Deco Aquar
Glass Rock Slag Cullet Multi Colors 212 lb Rocks T60 Landscaping Deco Aquar
$14.00
Glass Rock Slag Cullet Yellow Pink Glow 210 lb Rocks T57 Landscaping Deco Aquar
Glass Rock Slag Cullet Yellow Pink Glow 210 lb Rocks T57 Landscaping Deco Aquar
$14.00
Glass Rock Slag Cullet Ruby Red 88 lb Rocks T50 Landscaping Deco Aquarium
Glass Rock Slag Cullet Ruby Red 88 lb Rocks T50 Landscaping Deco Aquarium
$72.00
Glass Rock Slag Cullet Yellow Pink Glow 22 lb Rocks T55 Landscaping Deco Aquari
Glass Rock Slag Cullet Yellow Pink Glow 22 lb Rocks T55 Landscaping Deco Aquari
$11.00
Glass Rock Slag Cullet Yellow Pink Glow 24 lb Rocks T59 Landscaping Deco Aquar
Glass Rock Slag Cullet Yellow Pink Glow 24 lb Rocks T59 Landscaping Deco Aquar
$12.00
Antique Northwood Dugan RARE Inverted Fan  Feather PINK CARMEL SLAG Tumbler
Antique Northwood Dugan RARE Inverted Fan Feather PINK CARMEL SLAG Tumbler
$74.99
Vintage Orange Slag Glass Mid Century Bowl Centerpiece LE Smith Art Glass
Vintage Orange Slag Glass Mid Century Bowl Centerpiece LE Smith Art Glass
$24.00
Imperial IG Indiana Glass Bowl Wimdmill Ruffled signed Paper Label Caramel Slag
Imperial IG Indiana Glass Bowl Wimdmill Ruffled signed Paper Label Caramel Slag
$12.50
Imperial Glass Purple  White Slag Swan with Sticker
Imperial Glass Purple White Slag Swan with Sticker
$19.00
Heisey Vintage Swan Purple  White Slag Covered Dish
Heisey Vintage Swan Purple White Slag Covered Dish
$19.00
Purple  White Slag Candy Dish
Purple White Slag Candy Dish
$10.00
Vtg Caramel Orange Boyd Degenhart Glass Heart Trinket Jewelry Box Pin Dish Slag
Vtg Caramel Orange Boyd Degenhart Glass Heart Trinket Jewelry Box Pin Dish Slag
$14.50
Imperial Red Slag Glass Feather Panel 1560 Pattern Candy Dish LID ONLY
Imperial Red Slag Glass Feather Panel 1560 Pattern Candy Dish LID ONLY
$9.99
Fenton Atlantis Vase Chocolate Brown Slag Raised Koi Fish Sealife Design 2662
Fenton Atlantis Vase Chocolate Brown Slag Raised Koi Fish Sealife Design 2662
$49.99
HTF Fenton Purple Slag Glass Grape  Cable Covered Tobacco Jar Item 2453
HTF Fenton Purple Slag Glass Grape Cable Covered Tobacco Jar Item 2453
$195.00
Set of 3 Imperial Glass Caramel Slag Wine or Juice Goblets Item 173
Set of 3 Imperial Glass Caramel Slag Wine or Juice Goblets Item 173
$29.99
Fenton Blue  White Marble Slag Glass Rose Compote Pedestal Candy Dish Item 1861
Fenton Blue White Marble Slag Glass Rose Compote Pedestal Candy Dish Item 1861
$19.99
Gibson Glass Red  White Iridescent Slag Glass Pear Shaped Paperweight Item 169
Gibson Glass Red White Iridescent Slag Glass Pear Shaped Paperweight Item 169
$24.99
Imperial Ruby Red  White Slag Glass Three in One Toothpick Holder Item 1594
Imperial Ruby Red White Slag Glass Three in One Toothpick Holder Item 1594
$9.99
Fenton Atlantis Vase Chocolate Brown Slag Raised Koi Fish Sealife Design 189
Fenton Atlantis Vase Chocolate Brown Slag Raised Koi Fish Sealife Design 189
$49.99
Imperial Purple Slag Glass Hobstar or Belaire Toothpick Holder Item 1433
Imperial Purple Slag Glass Hobstar or Belaire Toothpick Holder Item 1433
$9.99
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
Fenton Chocolate Slag Glass Bicentennial Eagle Paperweight Item 1734
Fenton Chocolate Slag Glass Bicentennial Eagle Paperweight Item 1734
$14.99
Imperial Caramel Slag Glass Donkey Figurine 6 1 2 Tall Item 687
Imperial Caramel Slag Glass Donkey Figurine 6 1 2 Tall Item 687
$19.99
Rare Fenton Orange  Yellow Slag Glass Alley Cat Figurine Great Colors 2266
Rare Fenton Orange Yellow Slag Glass Alley Cat Figurine Great Colors 2266
$119.99
Fenton Atlantis Vase Chocolate Brown Slag Raised Koi Fish Sealife Design 190
Fenton Atlantis Vase Chocolate Brown Slag Raised Koi Fish Sealife Design 190
$49.99
Imperial Red  White Slag Glass Pitcher Windmill Design 2015
Imperial Red White Slag Glass Pitcher Windmill Design 2015
$19.99
Imperial 3 Toed Caramel Slag Glass Bowl w Rose Design 8 1 4 Wide Item 654
Imperial 3 Toed Caramel Slag Glass Bowl w Rose Design 8 1 4 Wide Item 654
$11.99
Fenton Hobnail Blue Marble Slag Glass Heart Shaped Nappy Dish Item 2422
Fenton Hobnail Blue Marble Slag Glass Heart Shaped Nappy Dish Item 2422
$19.99
Imperial Ruby Red Slag Glass Tumbler w Grape Design 4 Tall Item 167
Imperial Ruby Red Slag Glass Tumbler w Grape Design 4 Tall Item 167
$8.99
Joe St Clair Chocolate Slag Glass Toothpick Holder Item 1589
Joe St Clair Chocolate Slag Glass Toothpick Holder Item 1589
$5.00
Pair Vintage Akro Agate Orange  White Slag Glass Lily Flower Vases
Pair Vintage Akro Agate Orange White Slag Glass Lily Flower Vases
$49.99
Mosser caramel slag glass bear figure
Mosser caramel slag glass bear figure
$12.75
BOYDS Art Glass Special Train Set Carmel Slag Glass 6 Piece Set
BOYDS Art Glass Special Train Set Carmel Slag Glass 6 Piece Set
$59.99
Vintage Raised Grape Pattern Imperial Glass Red Slag Cup Vase 4 Glass
Vintage Raised Grape Pattern Imperial Glass Red Slag Cup Vase 4 Glass
$19.99
Fenton Glass Slag Green Double Votive Candle Holder Leaf Matin 2 Way
Fenton Glass Slag Green Double Votive Candle Holder Leaf Matin 2 Way
$7.57


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