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tweddillite

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Journal Article
Published: 01 August 2016
Mineralogical Magazine (2016) 80 (5): 877–880.
... the epidote supergroup ( Mills et al ., 2009 ). In order to comply with these rules, it was decided to rename the already approved minerals hancockite, niigataite and tweddillite to epidote-(Pb), clinozoisite-(Sr) and manganipiemontite-(Sr), respectively. These names were already well established within...
FIGURES
Journal Article
Published: 01 February 2002
Mineralogical Magazine (2002) 66 (1): 137–150.
...T. Armbruster; E. Gnos; R. Dixon; J. Gutzmer; C. Hejny; N. Döbelin; O. Medenbach Abstract The new minerals manganvesuviante and tweddillite, both formed by hydrothermal alteration of primary manganese ores, are described from the Kalahari manganese fields (Republic of South Africa). In addition...
FIGURES
Image
Thin-section of <b>tweddillite</b> blades (red-orange) in a matrix of serandite-pe...
Published: 01 February 2002
F ig . 2. Thin-section of tweddillite blades (red-orange) in a matrix of serandite-pectolite (white). The opaque mineral is braunite. Base of photograph is 3.2 mm long; plane polarized light.
Image
Thin-section of (100) twinned <b>tweddillite</b> blades (red-orange-magenta) in a ...
Published: 01 February 2002
F ig . 3. Thin-section of (100) twinned tweddillite blades (red-orange-magenta) in a matrix of serandite-pectolite (white-grey-yellow). Base of photograph is 1 mm long; crossed polars.
Journal Article
Published: 01 September 2006
European Journal of Mineralogy (2006) 18 (5): 551–567.
... approved species: Niigataite (old) = clinozoisite-(Sr) (new) , hancockite (old) = epidote-(Pb) (new) , tweddillite (old) = manganipiemontite-(Sr) (new) . Minor modifications are necessary for the following species: Strontiopiemontite (old) = piemon-tite-(Sr) (new) , androsite-(La) (old) = manganiandrosite...
FIGURES
Image
The A2-O7 bond distance vs. the Sr content in the A2 site in members of the...
Published: 02 January 2004
Figure 7. The A2-O7 bond distance vs. the Sr content in the A2 site in members of the piemontite-strontiopiemontite and piemontite-tweddillite series. The equation of the regression line is A2-O7 = 2.249(2) + 0.160(5) Sr A2 ( r = 0.993). Symbols: solid circle = piemontite, type locality
Image
a) Mean octahedral M3-O distance plotted vs. the M 3+  (= Mn 3+  + Fe 3+ ) ...
Published: 02 January 2004
, type locality ( Ferraris et al. 1989 ); open circles = piemontite, different localities ( Bonazzi 1990 ); crosses = strontiopiemontites, type locality ( Bonazzi et al. 1990 ); star = tweddillite, type locality ( Armbruster et al. 2002 ); solid squares = piemontite, different localities ( Langer et al
Image
Unit cell parameters,  a  (a),  b  (b),  c  (c), and the monoclinic β angle...
Published: 02 January 2004
( Bermanec et al. 1994 ); solid diamond = REE-bearing piemontite, Varenche mine ( Bonazzi et al. 1996 ); open upward triangle = androsite-(La), type locality ( Bonazzi et al. 1996 ); star = tweddillite, type locality ( Armbruster et al. 2002 ); solid squares = piemontite, different localities ( Langer et al
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List of new minerals discovered in the Kalahari Manganese Field.         IM...
Published: 26 February 2019
Nyfeler et al. ( 1995 ) 1994–055 Wesselsite SrCuSi 4 O 10 P 4 /ncc; Giester and Rieck ( 1996 ) 2000–040 Manganvesuvianite Ca 19 Mn Al 10 Mg 2 (SiO 4 ) 10 (Si 2 O 7 ) 4 O(OH) 9 P 4 /n Armbruster et al. ( 2002 ) 2001–014 Tweddillite CaSr(Mn 3+ ,Fe 3+ ) 2 Al[Si 3 O 12 ](OH) P 2
Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 495–552.
...Figure 7. The A2-O7 bond distance vs. the Sr content in the A2 site in members of the piemontite-strontiopiemontite and piemontite-tweddillite series. The equation of the regression line is A2-O7 = 2.249(2) + 0.160(5) Sr A2 ( r = 0.993). Symbols: solid circle = piemontite, type locality...
FIGURES | View All (19)
Journal Article
Published: 01 January 2003
American Mineralogist (2003) 88 (1): 251–255.
... History Museum, Vienna, Austria. J.L.J. T. Armbruster, E. Gnos, R. Dixon, J. Gutzmer, C. Hejny, N. Döbelin, O. Medenbach ( 2002 ) Manganvesuvianite and tweddillite, two new Mn 3+ -silicate minerals from the Kalahari manganese fields, South Africa. Mineral. Mag. , 66 , 137 –150...
Journal Article
Published: 01 October 2002
The Canadian Mineralogist (2002) 40 (5): 1529–1550.
... given here. The crystal drawing was produced here from the information given in the paper and was approved by Prof. Armbruster. A rmbruster , T., G nos , E., D ixon , R., G utzmer , J., H ejny , C., D obelin , N. & M edenbach , O. ( 2002 ): Manganvesuvianite and tweddillite, two new Mn 3...
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Journal Article
Published: 26 February 2019
Mineralogical Magazine (2019) 83 (5): 645–654.
... Nyfeler et al. ( 1995 ) 1994–055 Wesselsite SrCuSi 4 O 10 P 4 /ncc; Giester and Rieck ( 1996 ) 2000–040 Manganvesuvianite Ca 19 Mn Al 10 Mg 2 (SiO 4 ) 10 (Si 2 O 7 ) 4 O(OH) 9 P 4 /n Armbruster et al. ( 2002 ) 2001–014 Tweddillite CaSr(Mn 3+ ,Fe 3+ ) 2 Al[Si 3 O 12 ](OH) P 2...
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Journal Article
Published: 01 July 2004
American Mineralogist (2004) 89 (7): 1119–1129.
... contain more Mn 3+ than common Ca-piemontite, even if their genetic conditions are similar; see, for example, tweddillite (Sr-rich piemontite) from the Kalahari manganese field, South Africa (1.58 Mn 3+ + 0.19 Fe 3+ = 1.77; Armbruster et al. 2002 ) and from the Fukuyama manganiferous iron ore deposit...
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Journal Article
Published: 01 August 2010
American Mineralogist (2010) 95 (8-9): 1237–1246.
.... , Dixon , R. , Gutzmer , J. , Hejny , C. , Döbelin , N. , and Medenbach , O. ( 2002 ) Manganvesvianite and tweddillite, two new Mn 3+ -silicate minerals from the Kalahari manganese fields, South Africa . Mineralogical Magazine , 66 , 137 – 150 . Bermanec , V...
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Journal Article
Published: 01 August 2015
Mineralogical Magazine (2015) 79 (4): 941–947.
..., are defined as neotypes. The type locality is Snarum, Modum, Buskerud, Norway. Nomenclature of epidotes A proposal concerning nomeclature within the epidote supergroup is accepted, and the names hancockite, niigataite and tweddillite are reinstated instead of epidote-(Pb), clinozoisite-(Sr...
Journal Article
Published: 01 April 2007
The Canadian Mineralogist (2007) 45 (2): 239–248.
.... , Dobelin , N. & Medenbach , O. ( 2002 ): Manganvesuvianite and tweddillite, two new Mn 3+ -silicate minerals from the Kalahari manganese fields, South Africa . Mineral. Mag . 66 , 137 – 150 . Bellatreccia , F. , Camara , F. , Ottolini , L. , Della Ventura , G...
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Journal Article
Published: 01 December 2003
The Canadian Mineralogist (2003) 41 (6): 1371–1380.
... vesuvianite with pronounced octahedral cation ordering . Schweiz. Mineral. Petrogr. Mitt . 80 , 109 – 116 . Armbruster , T. , Gnos , E. , Dixon , R. , Gutzmer , J. , Hejny , C. , Dobelin , N. & Medenbach , O. ( 2002 ): Manganvesu-vianite and tweddillite, two new Mn3...
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Journal Article
Published: 01 November 2016
The Canadian Mineralogist (2016) 54 (6): 1525–1537.
.... (2002) Manganvesuvianite and tweddillite, two new Mn 3+ -silicate minerals from the Kalahari manganese fields, South Africa . Mineralogical Magazine 661 , 137 – 150 . Brese, N.E. & O'Keeffe, M...
FIGURES
Journal Article
Published: 01 February 2007
American Mineralogist (2007) 92 (2-3): 416–423.
..., henritermierite . American Mineralogist , 86 , 147 – 158 . Armbruster , T. , Gnos , E. , Dixon , R. , Gutzmer , J. , Hejny , C. , Dobelin , N. , and Medenbach , O. ( 2002 ) Manganvesuvianite and tweddillite, two new Mn 3+ -silicate minerals from the Kalahari manganese fields...
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