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Pseudobrookite in rhyolite

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Journal Article
Published: 01 April 1942
American Mineralogist (1942) 27 (4): 305–322.
.... Pseudobrookite, Fe 2 O 3 · TiO 2 , occurs in cavities widely distributed throughout the tinbearing rhyolite. Crystals collected from one of the bixbyite localities show six new prism forms, d {560}, f {11.10.0}, g {650}, i {320}, j {830}, and k {410}. This is the third recorded occurrence in the United States...
Image
Backscattered electron images (false color) showing the variety of occurren...
Published: 01 February 2013
, which are used to identify data points in Figure 4 and Table 1 . Abbreviations on images: opx: orthopyroxene, cpx: clinopyroxene, ap: apatite, plag: plagioclase, mag: titanomagnetite, ilm: ilmenite, psb: pseudobrookite, glass: K-Na-Al-Si-rich rhyolitic glass, zrn: zircon. ( a ) glomerophyric cluster
Journal Article
Published: 01 February 2013
American Mineralogist (2013) 98 (2-3): 417–425.
..., which are used to identify data points in Figure 4 and Table 1 . Abbreviations on images: opx: orthopyroxene, cpx: clinopyroxene, ap: apatite, plag: plagioclase, mag: titanomagnetite, ilm: ilmenite, psb: pseudobrookite, glass: K-Na-Al-Si-rich rhyolitic glass, zrn: zircon. ( a ) glomerophyric cluster...
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Series: GSA Special Papers
Published: 01 January 1986
DOI: 10.1130/SPE205-p1
... plugs. Volumes of rock (<1 to 100 km 3 ) in individual complexes composed of 1 to many separate extrusions suggest that the lavas were erupted from small to medium sized magma bodies. In addition to topaz, these rhyolites also contain garnet, bixbyite, pseudobrookite, hematite, and fluorite...
Journal Article
Journal: Economic Geology
Published: 01 December 1982
Economic Geology (1982) 77 (8): 1818–1836.
..., pseudobrookite, specularite, quartz, and other minerals. In the western United States, Cenozoic (0.5-50 m.y. old for dated examples) topaz rhyolites occur on both sides of the Colorado Plateau (in Colorado, New Mexico, Arizona, Utah, and Nevada) and in Idaho and Montana. They also occur in a single linear belt...
Journal Article
Published: 01 June 1976
American Mineralogist (1976) 61 (5-6): 425–430.
...J. L. Lufkin Abstract Crystals of hematite, pseudobrookite, bixbyite, and cassiterite occur in cavities within miarolitic, lithophysal rhyolite in the Black Range of southwestern New Mexico. Compositional and paragenetic relationships are compatible with the results of pertinent phase equilibrium...
Journal Article
Published: 01 June 1970
American Mineralogist (1970) 55 (5-6): 1058–1060.
...Clifford Frondel Abstract Scandium is present in the range 0.1 to 0.7 weight percent Sc 2 O 3 in late-stage minerals, including pseudobrookite, bixbyite, spessartite, hematite and beryl, in the lithophysae of the rhyolite flows of the Thomas Mountains, Utah. The Sc 3+ ion substitutes for Fe 3...
Journal Article
Published: 01 July 2016
The Canadian Mineralogist (2016) 54 (4): 935–944.
... Pseudobrookite, (Fe 3+ ,Fe 2+ ) 2 (Ti,Fe 3+ )O 5 , is a typical vapor-phase mineral found in lithophysae in extrusive rocks: andesites, rhyolites, and lamproites ( Anthony et al . 1997 , Lufkin 1976 , Palache et al . 1944 ). Well-documented localities include the Thomas Range, Utah ( Ream 1979 ); the Black...
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Journal Article
Published: 01 April 2007
Clays and Clay Minerals (2007) 55 (2): 189–199.
... in association with rhyolitic cavities. Given the known localities of pseudobrookite, it is believed that this mineral was not deposited by aeolian forces. Pseudobrookite and its alteration products form by the following reaction: (1) \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage...
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Journal Article
Published: 01 August 2014
Mineralogical Magazine (2014) 78 (4): 1029–1041.
... that is zoned compositionally from high-silica rhyolite to latite. During cooling of the tuff, escaping vapour produced lithophysae (former gas cavities) lined with an assemblage of tridymite (commonly inverted to cristobalite or quartz), sanidine and locally, hematite and/or garnet. Vapour-phase topaz...
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Journal Article
Published: 01 April 2017
Mineralogical Magazine (2017) 81 (2): 217–250.
... -nepheline-kalsilite), where the nepheline syenites trend towards the phonolitic minimum, while the silica-oversaturated samples trend towards the rhyolite minimum, but without reaching it ( Fig. 4 ). Fig. 4. Nepheline–kalsilite–silica diagram (wt.%) for the rocks of Itatiaia. Univariant lines from...
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Journal Article
Published: 01 October 2008
European Journal of Mineralogy (2008) 20 (5): 713–720.
.... Italian osumilite occurrences are related to three localities: Mt. Arci ( Rossi, 1963 ), Vico volcano ( Parodi et al ., 1989 ) and, more recently, Vesuvius volcano ( Balassone et al ., 2004 ). The Mt. Arci sample comes from the rhyolitic deposit of Funtanafigu quarry. It shows a typical dark-blue...
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Journal Article
Published: 13 June 2008
Geological Magazine (2009) 146 (1): 133–143.
...SARBANI PATRANABIS-DEB; JUERGEN SCHIEBER; ABHIJIT BASU Abstract We report on the newly discovered almandine garnet phenocrysts in rhyolitic ignimbrites (Sukhda Tuff) in the Precambrian Churtela Shale Formation of the Chhattisgarh Supergroup in central India. SHRIMP ages of igneous zircon from...
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Journal Article
Published: 01 December 2023
American Mineralogist (2023) 108 (12): 2153–2163.
..., pseudobrookite, spessartine-almandine garnet, Mn-rich beryl, and cassiterite (e.g., Holfert 1978 ; Christiansen et al. 1980 ). The unusual nature of this mineral assemblage, its prevalence in topaz rhyolite, and the chemistry of the rhyolite itself, all suggest that the vapor was sourced from the rhyolite...
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Journal Article
Published: 01 May 2015
American Mineralogist (2015) 100 (5-6): 1153–1164.
... ) Bixbyite and pseudobrookite from the tin-bearing rhyolite of the Black Range, New Mexico . American Mineralogist , 27 , 305 – 322 . Frost D.J. Wood B.J. ( 1997 ) Experimental measurements of the fugacity of CO 2 and graphite/diamond stability from 35 to 77 kbar at 925 to 1650 °C...
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Journal Article
Published: 01 April 2004
American Mineralogist (2004) 89 (4): 564–571.
... and below a “critical f O 2 ” (about 10 −11.3 atm at 1300 °C, see Table 1 ), the liquidus phase rutile is replaced by Mg-Ti oxide phase with the value of Ti/Mg (atomic) exceeding two. As the most TiO 2 -rich phase in the MgO-TiO 2 binary is karrooite, we suggest that this phase is a pseudobrookite-type...
FIGURES
Journal Article
Published: 01 October 2005
The Canadian Mineralogist (2005) 43 (5): 1545–1552.
... species found on hematite and topaz crystals in cavities and fractures in rhyolite from Searle Canyon, Thomas Range, Utah, USA ( Belakovskiy et al. 2006 ). Previously, its occurrence was discussed by Foord et al. (1995) , Holfert et al. (1996) and Belakovskiy & Pautov (2002...
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Journal Article
Published: 01 August 2018
American Mineralogist (2018) 103 (8): 1228–1252.
... et al. 1983 , 2007 ). Topaz rhyolite often contain vapor-phase topaz, fluorite, bixbyite, pseudobrookite, garnet, and hematite within their devitrified groundmasses or in small vugs; red beryl is a rare but distinctive secondary mineral ( Christiansen et al. 1986 , 1997 ). In comparison to other...
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Journal Article
Published: 01 December 2023
Russ. Geol. Geophys. (2023) 64 (12): 1408–1429.
... to those in basanite. The compositions of mudstone, clinker, silty sandstone, and sandstone plot in the field of dacite and rhyolite, while Fe-rich samples MN-1363 and MN-1368 correspond to basaltic andesite. Samples MN-1370, MN-1369, and MN-1416 contain 40–52 wt.% FeO tot ( Table 1 , analyses 9, 10, 13...
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Journal Article
Published: 01 June 2015
Mineralogical Magazine (2015) 79 (3): 545–581.
... ), hercynite (hc 61.4 mag 31.8 usp 5.9 spl 0.9 ) and a phase matching pseudobrookite ( Fe 1.92 3 + Mn 0.08 )TiO 5 . The zircon U-Pb age (SHRIMP) results (Tables 4 , 5 ) constrain the time of sapphire crystallization. The internal zircon is slightly younger (mean age 2.61±0.16 Ma) than outer rim...
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