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tawmawite

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Polarized room temperature spectra of a natural Cr 3+  epidote (“<b>tawmawite</b>”...
Published: 02 January 2004
Figure 6. Polarized room temperature spectra of a natural Cr 3+ epidote (“tawmawite”) and the corresponding energy level diagram. Redrawn and modified after Burns and Strens (1967) .
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Change of n (upper part) and 2V Z  (lower part) in clinozoisite-<b>tawmawite</b> s...
Published: 02 January 2004
Figure 20. Change of n (upper part) and 2V Z (lower part) in clinozoisite-tawmawite solid solutions and the change in orientation of the optical axial plane; the diagram is not to scale due to the small number of data.
Published: 01 January 2013
EISBN: 9780903056434
... , analysis 1, p. 58). Manganese is present in only small quantities even in the manganese-bearing variety, thulite; a green Cr-bearing variety, tawmawite and a V-bearing gem-variety, tanzanite are also known. Zoisite has been synthesized by a number of methods including its preparation by hydrothermal...
FIGURES
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Optical orientation of monoclinic clinozoisite-epidote (upper part), epidot...
Published: 02 January 2004
Figure 16. Optical orientation of monoclinic clinozoisite-epidote (upper part), epidote-piemontite (center), tawmawite and allanite (bottom); modified after Tröger 1982 .
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a. Classification of Tisovita–Iuti epidote-group minerals in a triangular d...
Published: 01 February 2009
, Taiwan (gabbros, veins in gabbros, rodingites) ( Liou & Ernst 1979 ). “Tawmawite” ( i.e. , Cr-rich epidote) is shown in quotation marks because it is not an IMA-approved name.
Journal Article
Published: 01 October 2011
European Journal of Mineralogy (2011) 23 (5): 731–743.
... not be reabsorbed. * Corresponding author, e-mail: nagashim@yamaguchi-u.ac.jp 02 5 2011 06 7 2011 25 7 2011 © 2011 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers 2011 clinozoisite epidote chromium vanadium Outokumpu amorphous metamict “tawmawite...
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Published: 01 January 2013
EISBN: 9780903056434
... epidotes, however, do contain appreciable amounts and show transitional characters towards allanite. Rare chromian (tawmawite), plumbian (hancockite) and vanadium-bearing (mukhinite) epidotes have been described. At temperatures above ~730°C there is continuous solid solution between clinozoisite...
FIGURES
Journal Article
Published: 01 September 2006
European Journal of Mineralogy (2006) 18 (5): 551–567.
... mineral species was justified, as shown by structure refinement, because Mn 3+ dominates both octahedral M1 and M3 sites, different from just M3 in strontiopiemontite and piemontite. The name “tawmawite” was introduced by Bleeck (1907) in his description of jadeite deposits in Upper Burma (now...
FIGURES
Journal Article
Published: 01 June 2010
The Canadian Mineralogist (2010) 48 (3): 523–536.
...-member “tawmawite”, Ca 2 Al 2 Cr(SiO 4 )(Si 2 O 7 )O(OH), unless they contain more than 1 apfu Cr ( Armbruster et al. 2006 ). Epidote from Outokumpu, Finland, with up to 15 wt.% Cr 2 O 3 , corresponding to 0.98 Cr apfu , reaches most closely to the composition of “tawmawite” ( Treloar 1987a...
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Journal Article
Published: 01 August 2020
American Mineralogist (2020) 105 (8): 1242–1253.
... equilibrium with the retrograde assemblage, are enriched in Cr relative to the core of the same crystals (≤12.40 wt% Cr 2 O 3 ), which resulted from the Al − 1 Cr + 1 3 + substitution toward the tawmawite end-member [Ca 2 Al 2 Cr 3+ Si 3 O 12 (OH)], with sometimes a Cr enrichment...
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Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 1–81.
...Figure 20. Change of n (upper part) and 2V Z (lower part) in clinozoisite-tawmawite solid solutions and the change in orientation of the optical axial plane; the diagram is not to scale due to the small number of data. ...
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Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 125–170.
...Figure 6. Polarized room temperature spectra of a natural Cr 3+ epidote (“tawmawite”) and the corresponding energy level diagram. Redrawn and modified after Burns and Strens (1967) . ...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2014
DOI: 10.1144/SP386.8
EISBN: 9781862396630
...–tremolite–tawmawite–pyrrhotite rock DHZ 6 35.88 0.00 1.13 27.04 2.46 0.00 0.03 0.04 33.31 We used Pascal computer programs to input the data and to calculate garnet formulae on the basis of 24 oxygens in order to estimate ferric iron, and then calculated the common garnet end-member...
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Journal Article
Published: 01 January 2008
American Mineralogist (2008) 93 (1): 63–73.
... one Cr-rich composition (0.713 Cr apfu, Table 2 ) indicates the presence of a Cr-dominant member in the M3 position (Fig. 7 ). However, preliminary structural results for Cr-rich clinozoisite or epidote (called “tawmawite”), from Outokumpu, Finnland, indicate that Cr is disordered over the M3 and M1...
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Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 301–345.
... . This composition is close to the theoretical Cr end-member (tawmawite, X Cr33 ) of the clinozoisite-epidote series. The T-P conditions of amphibolite facies regional metamorphism of the Outukumpu rocks are estimated at 600 ± 50°C and 3.5 ± 1 kbar ( Treloar et al. 1981 ). At Tawmaw, epidote occurs with zoisite...
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Journal Article
Published: 01 October 2009
American Mineralogist (2009) 94 (10): 1351–1360.
... ; Treloar 1987 ; Sánchez-Vizcaíno et al. 1995 ; Devaraju et al. 1999 ; Nagashima et al. 2006 ). The term “tawmawite” was proposed years ago for Cr 3+ -analog of epidote ( Bleeck 1907 ). However, its composition does not show epidote-group stoichiometry, and no epidote-group mineral with Cr > 0.5...
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Journal Article
Published: 01 February 2009
The Canadian Mineralogist (2009) 47 (1): 81–105.
..., Taiwan (gabbros, veins in gabbros, rodingites) ( Liou & Ernst 1979 ). “Tawmawite” ( i.e. , Cr-rich epidote) is shown in quotation marks because it is not an IMA-approved name. ...
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Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 431–493.
... with > 15 wt% Cr 2 O 3 , i.e., close to the endmember tawmawite, Ca 2 CrAl 2 Si 3 O 11 O(OH). Thus, there appears to be at least limited solid solution between tawmawite and dissakisite, via the substitution (26) \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb...
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Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 553–605.
...” is problematic and ambiguous for the epidote minerals because they form solid solutions with actual end members whose components are usually abundant only as minor or trace elements, such as piemontite Ca 2 Al 2 ( Mn 3+ ,Fe 3+ )Si 3 O 11 O(OH), mukhinite Ca 2 Al 2 V 3+ Si 3 O 11 O(OH), tawmawite...
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