| Name: | Cummingtonite Cum |
| IMA Chemistry: | [box]Mg2Mg5Si8O22(OH)2 |
| Chemistry Elements: | The mineral Cummingtonite contains elements: Magnesium (Mg) Silicon (Si) Oxygen (O) Hydrogen (H) |
| Country of Type Locality: | Norway |
| Year First Published: | 1824 |
| IMA Status: | Approved,Redefined |
| Status Notes: | Dewey C (1824) A sketch of the geology and mineralogy of the western part of Massachusetts, and a small part of the adjoining states, The American Journal of Science and Arts 8, 1-60 Redefined by IMA nomenclature commission: Leake B E, Woolley A R, Arps C E S, Birch W D, Gilbert M C, Grice J D, Hawthorne F C, Kato A, Kisch H J, Krivovichev V G, Linthout K, Laird J, Mandarino J A, Maresch W V, Nickel E H, Rock N M S, Schumacher J C, Smith D C, Stephenson N C N, Ungaretti L, Whittaker E J W, Youzhi G (1997) Nomenclature of amphiboles: Report of the subcommittee on amphiboles of the International Mineralogical Association, commission on new minerals and mineral names, The Canadian Mineralogist 35, 219-246 |
| Structural Group Name: | Amphibole |
| Fleischer's Group Name: | amphibole-group 1 Mg-Fe-Mn-Li |
| Crystal Systems: | monoclinic |
| Oldest Known Age: | 4000 Million Years Ago |
| Mohs Hardness: | 5.5 |
| Diaphaneity: | 2.0 |
| Specific Gravity: | 3.35 |
| More Info: | Search Wikipedia: Cummingtonite (Wiki) Search Mindat: Cummingtonite Search Web Mineral DB: Cummingtonite |