Coexisting cummingtonite and aluminous hornblende from garnet amphibolite, Boehls Butte area, Idaho, USA
LITHOS
By: A. Hietanen
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Abstract
Electron microprobe analyses of green hornblende and coexisting cummingtonite from garnet amphibolite show identical Fe/Mg ratios ( = 0.9). Cummingtonite is iron-magnesium silicate with very little calcium and aluminum and practically no alkalies. In contrast, the hornblende has 1.5 tetrahedral Al, 0.9 octahedral Al and a considerable amount of Ca and alkalies. Comparison with the hornblendes from the Sierra Nevada shows a higher relative amount of tschemakite molecule in the hornblendes from Idaho where pressures during the recrystallization were higher.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Coexisting cummingtonite and aluminous hornblende from garnet amphibolite, Boehls Butte area, Idaho, USA |
| Series title | LITHOS |
| DOI | 10.1016/0024-4937(73)90086-8 |
| Volume | 6 |
| Issue | 3 |
| Year Published | 1973 |
| Language | English |
| Publisher | Elsevier |
| Description | 4 p. |
| First page | 261 |
| Last page | 264 |
| Country | United States |
| State | Idaho |