1-20 OF 25 RESULTS FOR

tweddillite

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
×Close Modal
Sort by
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
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.
... Mineralogie und Geologie, Dresden, Germany. 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.
.... At the N’Chwaning II mine, it is a rock-forming mineral intergrown with manganese-poor grossular or xonotlite and calcite in lenticular calc-silicate bodies within manganese ore beds. Additional associated minerals are: calcite, sérandite–pectolite, strontiopiemontite–tweddillite, mozartite and hydrogrossular...
FIGURES | View All (10)
Journal Article
Published: 01 July 2004
American Mineralogist (2004) 89 (7): 1119-1129.
... 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, Tokoro, Hokkaido (1.53 Mn 3+ + 0.21 Fe 3+ = 1.74; Akasaka et al. 1987 ). Enami...
FIGURES | View All (8)
Journal Article
Published: 01 August 2010
American Mineralogist (2010) 95 (8-9): 1237-1246.
... Ca 2 Al 3− p Mn 3+ p (Si 2 O 7 /SiO 4 /O/OH) . Contributions to Mineralogy and Petrology , 60 , 225 – 245 . Armbruster , T. , Gnos , E. , Dixon , R. , Gutzmer , J. , Hejny , C. , Döbelin , N. , and Medenbach , O. ( 2002 ) Manganvesvianite and tweddillite...
FIGURES | View All (7)
Journal Article
Published: 01 August 2015
Mineralogical Magazine (2015) 79 (4): 941-947.
... and tweddillite are reinstated instead of epidote-(Pb), clinozoisite-(Sr) and manganipiemontite-(Sr), respectively. IMA No. 2015-039 Chongite New structure type Zeolite supergroup Monoclinic: I 2; structure determined Spring Creek copper mine, 10 km south of Wilmington, South Australia...
Journal Article
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 637-646.
... vesuvianites: indication of a hydrogarnet-like substitution . Am. Mineral. , 85 , 570 – 577 . Armbruster , T. , Gnos , E. , Dixon , R. , Gutzmer , J. , Hejny , C. , Döbelin , N. , Medenbach , O. ( 2002 ): Manganvesuvianite and tweddillite, two new Mn 3...
FIGURES | View All (7)
Journal Article
Published: 01 April 2007
The Canadian Mineralogist (2007) 45 (2): 239-248.
... 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. , Cibin , G. & Mottana , A. ( 2005a ): Wiluite from Ariccia, Latium...
FIGURES | View All (4)
Journal Article
Published: 01 December 2003
The Canadian Mineralogist (2003) 41 (6): 1371-1380.
.... 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+-silicate minerals from the Kalahari manganese fields, South...
FIGURES | View All (4)
Journal Article
Published: 01 November 2016
The Canadian Mineralogist (2016) 54 (6): 1525-1537.
...., Dixon, R., Gutzmer, J., Heiny, C., Dobelin, N., & Medenbach, O. (2002) Manganvesuvianite and tweddillite, two new Mn 3...
FIGURES
Journal Article
Published: 01 February 2007
American Mineralogist (2007) 92 (2-3): 416-423.
.... , Dobelin , N. , and Medenbach , O. ( 2002 ) Manganvesuvianite and tweddillite, two new Mn 3+ -silicate minerals from the Kalahari manganese fields, South Africa . Mineralogical Magazine , 66 , 137 – 150 . Belov , N.V. ( 1973 ) Essays in Structural Mineralogy , p. 278 . Nauka...
FIGURES | View All (5)
Journal Article
Journal: Economic Geology
Published: 01 January 2002
Economic Geology (2002) 97 (1): 185-191.
.... Keay, and N.J. McNaughton 883 Causes for axial high topography at mid-ocean ridges and the role of crustal thermal structure— A.K. Shah and W.R. Buck 079 Manganvesuvianite and tweddillite, two new Mn 3+ -silicate minerals from the Kalahari manganese fields...