| Abstract: | Boromuscovite, ideally KAl2(Si3B)O10(OH,F)2, in which [4]Al is replaced by B relative to muscovite, occurs as a late-stage, postpocket rupture mineral within the New Spaulding Pocket, main Little Three pegmatite dike. The mineral is white to cream colored and occurs as a porcelaneous veneer and coating on primary minerals. The average grain size is less than 3-4 ??m, but the coatings may be as much as 1 cm or more thick. Fragments of topaz, albite, elbaite, and other pocket minerals are included in the coating. The boromuscovite precipitated from a late-stage hydothermal fluid; it occurs only as a snowlike coating. Chemical composition, unit-cell parameters, Mohs hardness, cleavage, fracture, and optical properties are reported. -from Authors |
| Genre: | Article |
| ProdID: | 70016456 |
| Citation Author: | Foord, E. E.; Martin, R. F.; Fitzpatrick, J. J.; Taggart, Jr, J. E.; Crock, J. G. |
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| Citation End Page: | 2002 |
| Citation Issue: | 11-12 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Mineralogist |
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| Citation Number Of Pages: | 5 |
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| Citation Search Results Text: | Boromuscovite, a new member of the mica group, from the Little Three mine pegmatite, Ramona district, San Diego County, California; 1991; Article; Journal; American Mineralogist; Foord, E. E.; Martin, R. F.; Fitzpatrick, J. J.; Taggart, Jr, J. E.; Crock, J. G. |
| Citation Start Page: | 1998 |
| Citation Volume: | 76 |
| Citation Year: | 1991 |
| Type: | citation/reference |
| Text: | Boromuscovite, a new member of the mica group, from the Little Three mine pegmatite, Ramona district, San Diego County, California; 1991; Article; Journal; American Mineralogist; Foord, E. E.; Martin, R. F.; Fitzpatrick, J. J.; Taggart, Jr, J. E.; Crock, J. G. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1991 00:00 -0600 |
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