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Ramona District

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Journal Article
Published: 01 December 1991
American Mineralogist (1991) 76 (11-12): 1998–2002.
... Little Three pegmatite dike, Ramona district, San Diego County, California. 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 μ m, but the coatings may be as much as 1 cm or more thick. Fragments of topaz...
Journal Article
Published: 01 October 1962
American Mineralogist (1962) 47 (9-10): 1123–1138.
...Dale R. Simpson Abstract Typical graphic granite forms about one-third of the containing pegmatite dikes in the Romona district, California. A quartz-perthite ratio of about 1:3 characterizes this graphic granite, and the microcline-albite ratio within the perthite is about 2:1. The quartz rods...
Journal Article
Published: 01 August 2012
The Canadian Mineralogist (2012) 50 (4): 1025–1054.
... Wolf & London (1997) . 2 ASI = molar Al 2 O 3 /(Na 2 O + K 2 O + CaO); K* = molar K 2 O/(K 2 O + Na 2 O). The pegmatites of the Little Three mine are located within the Ramona pegmatite district, ∼7.5 km east of Ramona, San Diego County, California, USA (coordinates +33° 3’ 28.44...
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Series: GSA Field Guide
Published: 01 January 2010
DOI: 10.1130/2010.0018(04)
EISBN: 9780813756189
... offer a consistent structural model for dike injection. The largest dikes occur along the western margin of the Manitou Park half-graben. Two stops will be made in this district; the first at a small-scale dike that demonstrates the injectite nature, and the second at a large-scale body of 100 m...
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Journal Article
Published: 01 December 2012
The Canadian Mineralogist (2012) 50 (6): 1555–1571.
...Fernando Colombo; Jorge Sfragulla; José González del tánago Abstract Members of the beusite–graftonite series [Mn/(Mn+Fe) between 0.47 and 0.65] appear associated to P-bearing garnet (up to 1.10 wt.% P 2 O 5 in the crystal cores) in two primitive pegmatites of the Pocho district, Córdoba, central...
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Journal Article
Journal: Lithosphere
Published: 20 December 2018
Lithosphere (2019) 11 (1): 91–128.
... into prebatholithic metamorphic host rocks adjacent to gabbro/tonalite plutons. No granodiorite, monzogranite, or granite plutons in any NPRB zone have been shown to host REE- and Li-pegmatites. (Note, while Patterson [2009 , p. 287] stated the Rincon district, Ramona district, and Pala Chief and Harriet Mountains...
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Journal Article
Published: 01 August 2016
American Mineralogist (2016) 101 (8): 1906–1915.
... in pegmatites and to ultimately understand why some pegmatites in the San Diego County pegmatite district contain abundant, gem-quality, Li-bearing minerals in pockets, whereas others do not. In this district, lithium-cesium-tantalum type pegmatites occur in the Mesozoic Peninsular Ranges Batholith. Emplacement...
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Book Chapter

Series: Geological Society, London, Geology of Series
Published: 01 January 2011
DOI: 10.1144/GOTH.14
EISBN: 9781862393943
... present in the Gulf of Thailand. They are rare in the NE, although tree trunks are found commonly in Tertiary sand pits in Nakhon Ratchasima Province where they tend to have been subjected to petrification processes. Carboniferous coals were formerly mined in Na Duang District (Loei Province) and were...
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Journal Article
Published: 25 September 2009
Canadian Journal of Earth Sciences (2009) 46 (9): 675–687.
..., Foord et al. (1991 ; see also Snee and Foord 1991 ) obtained 40 Ar/ 39 Ar plateau ages in potassium feldspar, muscovite, and lepidolite of 95–100 Ma in the gem-bearing pegmatite dikes from the Pala, Mesa Grande, and Ramona districts ( Fig. 2 ). Structurally, the pegmatite dikes are both massive...
Journal Article
Published: 01 May 2003
American Mineralogist (2003) 88 (5-6): 830–836.
..., Ramona district, San Diego County, California . Mineralogical Record , 20 , 101 – 127 . Foord , E.E. , Martin , R.E. , Fitzpatrick , J.J. , Taggart Jr. J.E. , and Crock , J.J. ( 1991 ) Boromuscovite, a new member of mica group, from the Little Tree mine pegmatite, Ramona...
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Image
Sketch of San Diego County, California (after  Fisher 2002 ). The larger sq...
Published: 01 August 2016
Figure 1 Sketch of San Diego County, California (after Fisher 2002 ). The larger squares represent sample districts, labeled Jacumba (La Posta pegmatite) and Mesa Grande (Himalaya pegmatite). The other major districts described by Fisher (2002) are also shown with smaller squares and numbered
Journal Article
Published: 01 February 2014
American Mineralogist (2014) 99 (2-3): 543–546.
... pegmatite-aplite dike, Ramona District, California . Contributions to Mineralogy and Petrology , 136 , 310 – 330 . Morgan G.B. VI Acosta-Vigil A. London D. ( 2008 ) Diffusive equilibration between hydrous metaluminous-peraluminous liquid couples at 200 MPa (H 2 O), and alkali...
FIGURES
Journal Article
Journal: Elements
Published: 01 August 2012
Elements (2012) 8 (4): 263–268.
... GB VI London D ( 1999 ) Crystallization of the Little Three layered pegmatite-aplite dike, Ramona District, California . Contributions to Mineralogy and Petrology 136 : 310 - 330 Page LR 10 coauthors ( 1953 ) Pegmatite Investigations, 1942–1945, Black Hills, South Dakota...
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Journal Article
Published: 01 January 2018
European Journal of Mineralogy (2018) 30 (1): 177–182.
.... , Mason , R.A. , Martin , R.F. ( 1989 ): Mineralogy and paragenesis of the Little Three mine pegmatites, Ramona district, San Diego County, California . Mineral. Rec. , 20 , 101 – 127 . Ford , W.E. ( 1903 ): On the chemical composition of axinite . Am. J. Sci. , 15...
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Journal Article
Published: 01 December 2007
Clays and Clay Minerals (2007) 55 (6): 583–592.
... , 449 – 540 . Morgan , VI , G.B. and London , D. ( 1999 ) Crystallization of the Little Three layered pegmatite-aplite dike, Ramona District, California . Contributions to Mineralogy and Petrology , 136 , 310 – 330 . Mücke , A. ( 1983 ) Sekundäre Phosphat-und Sulfat...
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Journal Article
Published: 01 November 2019
American Mineralogist (2019) 104 (11): 1625–1637.
... Granitic Pegmatites, Southeastern Manitoba . Canadian Mineralogist , 36 , 447 – 462 . Laurs , B.M. , and Knox , K. ( 2001 ) Spessartine garnet from Ramona, San Diego County, California . Gems & Gemology , 37 , 278 – 295 . London , D. ( 2008 ) Pegmatites . Special...
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Journal Article
Journal: Geology
Published: 01 August 2003
Geology (2003) 31 (8): 685–688.
.... , eds., Granite-related mineral deposits: Geology, petrogenesis and tectonic setting : Montreal , Canadian Institute of Mining and Metallurgy , p. 184 – 187 . Morgan , G.B. , VI , and London , D. , 1999 , Crystallization of the Little Three layered pegmatite-aplite dike, Ramona...
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Journal Article
Published: 01 October 2008
European Journal of Mineralogy (2008) 20 (5): 905–916.
...., to the Little Three property. Jeffrey Patterson and Matt Taylor provided guidance around the pegmatite districts and Jim Student helped with sample collection. Carol Nabelek oversaw the ICP-OES analysis. Bill McDonough graciously gave access to JM to conduct analysis in the isotope laboratory at the University...
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Journal Article
Published: 01 August 2003
American Mineralogist (2003) 88 (8-9): 1369–1376.
... in tourmaline. Physics and Chemistry of Minerals , 14 , 163 –171. Morgan, G.B. VI and London, D. ( 1999 ) Crystallization of the Little Three layered pegmatite-aplite dike, Ramona District, California. Contributions to Mineralogy and Petrology , 136 , 310 –330. Novák, M. ( 2000 ) Compositional...
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Journal Article
Published: 01 April 2014
The Canadian Mineralogist (2014) 52 (2): 165–181.
.... ( 1999 ): The Zapot pegmatite, Mineral County, Nevada . The Mineralogical Record 30 , 277 – 292 . Foord E.E. Spaulding L.B. Jr. Mason R.A. Martin R.F. ( 1989 ): Mineralogy and paragenesis of the Little Three Mine pegmatites, Ramona District, San Diego County, California...
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