| Abstract: | The structures of two crystals of Li-bearing fluor-arfvedsonite (1) (K0.32Na0.68)Na2(Li0.48Fe 2+2.83Mn2+0.10Zn 0.06Fe3+1.46Ti0.07) (Si7.88Al0.12)O22[Fu1.15(OH) 0.85] and (2) (K0.25Na0.75)Na2(Li0.48Fe 2+2.84Mn2+0.11Zn 0.05Fe3+1.45Ti0.07)(Si 7.89Al0.11)O22[F1.35(OH) 0.65] from a granitic pegmatite, Hurricane Mountain, New Hampshire, have been refined to R indices of 1.5(1.6)% based on 1380(1387) reflections measured with MoK?? X-radiation. The unit cell parameters are (1) a 9.838(4), b 17.991(6), c 5.315(2) A??, 103.78(3)??, V 913.7 A??3 and (2) a 9.832(3), b 17.990(7), c 5.316(3) A??, ?? 103.79(3)??, V 913.2 A??3. Site-scattering refinement shows Li to be completely ordered at the M(3) site in these crystals. The amphibole composition is intermediate between fluor-arfvedsonite and fluor-ferro-leakeite with a small component (???10%) of fluor-ferro-ferri-nybo??ite. These amphibole crystals project into miarolitic cavities in a pegmatitic phase of a riebeckite granite. The early-crystallizing amphibole is close to fluor-ferro-leakeite in composition, but becomes progressively depleted in Li and F as crystals project out into miarolitic cavities; the final amphibole to crystallize is a fibrous Li-poor riebeckite. Li plays a significant role in late-stage fractionation involving the crystallization of alkali amphibole in peralkaline granitic environments. |
| Genre: | Article |
| ProdID: | 70018148 |
| Citation Author: | Hawthorne, F. C.; Oberti, R.; Ottolini, L.; Foord, E. E. |
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| Citation End Page: | 1019 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Canadian Mineralogist |
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| Citation Number Of Pages: | 5 |
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| Citation Search Results Text: | Lithium-bearing fluor-arfvedsonite from Hurricane Mountain, New Hampshire: A crystal-chemical study; 1996; Article; Journal; Canadian Mineralogist; Hawthorne, F. C.; Oberti, R.; Ottolini, L.; Foord, E. E. |
| Citation Start Page: | 1015 |
| Citation Volume: | 34 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Lithium-bearing fluor-arfvedsonite from Hurricane Mountain, New Hampshire: A crystal-chemical study; 1996; Article; Journal; Canadian Mineralogist; Hawthorne, F. C.; Oberti, R.; Ottolini, L.; Foord, E. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
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