Boromuscovite, a new member of the mica group, from the Little Three mine pegmatite, Ramona district, San Diego County, California
American Mineralogist
By: E.E. Foord, R.F. Martin, J. J. Fitzpatrick, J.E. Taggart Jr., and J.G. Crock
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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
Suggested Citation
Foord, E., Martin, R., Fitzpatrick, J.J., Taggart, J., and Crock, J., 1991, Boromuscovite, a new member of the mica group, from the Little Three mine pegmatite, Ramona district, San Diego County, California: American Mineralogist, v. 76, no. 11-12, p. 1998-2002.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Boromuscovite, a new member of the mica group, from the Little Three mine pegmatite, Ramona district, San Diego County, California |
| Series title | American Mineralogist |
| Volume | 76 |
| Issue | 11-12 |
| Year Published | 1991 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | American Mineralogist |
| First page | 1998 |
| Last page | 2002 |