Banded-ferruginous chert from Mesabi Range, Minnesota, USA
USA | |
| www.cleveland-cliffs.com/mining/northshore/stats.asp |
www.excaliburmineral.com/mins-z.htm | |
| www.dnr.state.mn.us/education/geology/digging/taconite.html |
USA | |
| www.cleveland-cliffs.com/mining/northshore/stats.asp |
www.excaliburmineral.com/mins-z.htm | |
| www.dnr.state.mn.us/education/geology/digging/taconite.html |
Mesabi Range, Minnesota, USA