| Calcite |  |
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| Formula: | CaCO3 |
| Localities: | Recorded from at least 6 localities in this region. |
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| Photo: © JWV 2007. Calcite from France Sotone Co. Flat Rock quarry, Seneca Co., Ohio, USA |
| Celestine | |
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| Formula: | SrSO4 |
| Localities: | Old quarries, Tiffin, Seneca Co., Ohio, USA Old quarry, Sandusky River, Tiffin, Seneca Co., Ohio, USA Old France Stone Co. quarry, Bascom, Seneca Co., Ohio, USA Maple Grove Stone Co. quarry (Basic Refractories quarry), Maple Grove, Seneca Co., Ohio, USA Big Four Railroad quarry, Old quarries, Tiffin, Seneca Co., Ohio, USA
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| Dolomite | |
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| Formula: | CaMg(CO3)2 |
| Localities: | Old quarries, Tiffin, Seneca Co., Ohio, USA Maple Grove Stone Co. quarry (Basic Refractories quarry), Maple Grove, Seneca Co., Ohio, USA
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| Fluorite |  |
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| Formula: | CaF2 |
| Localities: | Old quarries, Tiffin, Seneca Co., Ohio, USA Maple Grove Stone Co. quarry (Basic Refractories quarry), Maple Grove, Seneca Co., Ohio, USA Big Four Railroad quarry, Old quarries, Tiffin, Seneca Co., Ohio, USA
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| Photo: © C. Stefano '11. Fluorite from Maple Grove Stone Co. quarry, Maple Grove, Seneca Co., Ohio, USA |
| Galena | |
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| Formula: | PbS |
| Localities: | Old quarries, Tiffin, Seneca Co., Ohio, USA Maple Grove Stone Co. quarry (Basic Refractories quarry), Maple Grove, Seneca Co., Ohio, USA
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| Gold | |
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| Formula: | Au |
| Locality: | Honey Creek, Seneca Co., Ohio, USA |
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| Marcasite | |
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| Formula: | FeS2 |
| Locality: | Maple Grove Stone Co. quarry (Basic Refractories quarry), Maple Grove, Seneca Co., Ohio, USA |
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| Pyrite | |
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| Formula: | FeS2 |
| Locality: | Maple Grove Stone Co. quarry (Basic Refractories quarry), Maple Grove, Seneca Co., Ohio, USA |
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| Sphalerite |  |
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| Formula: | ZnS |
| Localities: | Old quarries, Tiffin, Seneca Co., Ohio, USA Maple Grove Stone Co. quarry (Basic Refractories quarry), Maple Grove, Seneca Co., Ohio, USA
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| Photo: © C. Stefano '09. Sphalerite from Tiffin, Seneca Co., Ohio, USA |
| Strontianite |  |
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| Formula: | SrCO3 |
| Localities: | Old quarries, Tiffin, Seneca Co., Ohio, USA Maple Grove Stone Co. quarry (Basic Refractories quarry), Maple Grove, Seneca Co., Ohio, USA
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| Photo: © Rockpick Legend Co.. Strontianite from Maple Grove Stone Co. quarry, Maple Grove, Seneca Co., Ohio, USA |
| Sulphur | |
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| Formula: | S8 |
| Locality: | Old quarries, Tiffin, Seneca Co., Ohio, USA |
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11 entries listed. 11 valid minerals.