Swedish Blue Slag, as the name suggest is from Swedish, it is bi-product of Iron. This comes in various Shades of Blues, Mineral composition is like glass or Silica.
| Hardness | Country of origin | Size and shape | Price |
|---|---|---|---|
| 6 to 7 | Sweden | various sizes and shape available | $20 each |
| hardness | 6, 7 |
|---|---|
| origin | Sweden |
| price | $10.00, $2 |
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