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welinite

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Journal Article
Published: 01 September 2018
The Canadian Mineralogist (2018) 56 (5): 799-809.
.... The structure determination for barwoodite ( R 1 = 0.0246 for 746 reflections with I o > 2σ I ) shows it to be isostructural with welinite, franciscanite, and örebroite. Together, these four minerals comprise the welinite group. Abstract The new mineral barwoodite (IMA2017-046), Mn 2+ 6 (Nb 5+ ,□) 2 (SiO 4...
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Journal Article
Published: 01 December 1986
American Mineralogist (1986) 71 (11-12): 1522-1526.
...Pete J. Dunn; Donald R. Peacor; Richard C. Erd; Robert A. Ramik Abstract Franciscanite and 6rebroite are new mineral species isotypic with welinite. Franciscanite, ideally Mn 6 [V,□] 2 Si 2 (0,0H) ~l4 , is hexagonal, has space group P 3, with a = 8.148(1) and c = 4.804(1) Å, V = 276.2 Å 3 , Z = 1...
Image
Crystal structure of <b>welinite</b>-group minerals.
Published: 01 September 2018
Fig. 4. Crystal structure of welinite-group minerals.
Image
COMPARISON OF BARWOODITE WITH FRANCISCANITE, OREBROITE, AND <b>WELINITE</b>
Published: 01 September 2018
TABLE 8. COMPARISON OF BARWOODITE WITH FRANCISCANITE, OREBROITE, AND WELINITE
Journal Article
Published: 01 June 1979
American Mineralogist (1979) 64 (5-6): 593-598.
... alternate in the structure parallel to (001), one consisting of networks of Mg octahedra and the other of blocks of three Mg octahedra. The first layer is identical to that found in welinite, Mn 2+ Mg 3 2+ SiO 7 , and the second one is similar to a layer observed in hematolite, (Mn 2+ ,Mg,Al) 15 (OH) 23...
Journal Article
Published: 01 February 1978
American Mineralogist (1978) 63 (1-2): 150-159.
... and occurs in an environment similar to that found in synadelphite, M 9 (OH) 9 (H 2 O) 2 (AsO 3 )(AsO 4 ) 2 . The five non-equivalent layers are: (1) isolated octahedra; (2) octahedral and tetrahedral sheet identical to that found in welinite, Mn 4+ Mn 3 2+ SiO 7 ; (3) octahedral and trigonal pyramidal sheet...
Image
Polyhedral representations of the two non-equivalent layers in zoltaiite. (...
Published: 01 October 2005
F igure 5. Polyhedral representations of the two non-equivalent layers in zoltaiite. ( a ) The X layer analogous to the octahedral layer forming synadelphite and phase-A; ( b ) the Y layer analogous to the layers found in hematolite and welinite (see text).
Journal Article
Published: 01 October 2005
American Mineralogist (2005) 90 (10): 1655-1660.
...F igure 5. Polyhedral representations of the two non-equivalent layers in zoltaiite. ( a ) The X layer analogous to the octahedral layer forming synadelphite and phase-A; ( b ) the Y layer analogous to the layers found in hematolite and welinite (see text). ...
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Journal Article
Published: 01 June 2018
Mineralogical Magazine (2018) 82 (3): 779-785.
...), which currently inclues seven mineral species. The welinite group is established. Minerals within the welinite group conform to the general formula M 2 2+ 6 ( M 1a M 1b) x + (SiO 4 ) 2 O ( x –2) (OH) (8– x ) , where x is the total charge per formula unit at the M 1 sites. The welinite group...
Journal Article
Published: 01 May 2018
European Journal of Mineralogy (2018) 30 (3): 647-652.
... 2 M 3 2 (H 2 O) 8 (OH) 2 (PO 4 ) 4 . The jahnsite group is divided into the jahnsite subgroup ( M 3 = Fe 3+ ), which currently includes ten mineral species, and the whiteite subgroup ( M 3 = Al), which currently includes seven mineral species. The welinite group is established. Minerals...
Journal Article
Published: 01 October 2013
American Mineralogist (2013) 98 (10): 1693-1696.
... ( Pertlik 1986 ), hematolite ( Moore and Araki 1978 ), kraissilite ( Moore and Ito 1978 ; Cooper and Hawthorne 2013 ), örebroite ( Dunn et al. 1986 ), and welinite ( Moore 1967 ). We thank Uwe Kolitsch and Kim Tait for their comments, and Mark Cooper for help with the crystal-structure aspects...
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Journal Article
Published: 28 February 2017
European Journal of Mineralogy (2017) 29 (5): 897-905.
...] and greater coordination (9.BE.70). Delhuyarite-(Ce) is one of few known nominally W-bearing silicates, the other ones being johnsenite-(Ce), khomyakovite, manganokhomyakovite (all of the eudialyte group), and welinite, Mn 6 [W,Mg] 2 Si 2 (O,OH) 14 . Johnsenite-(Ce) is the only REE and W-bearing silicate...
FIGURES
Journal Article
Published: 01 November 2001
American Mineralogist (2001) 86 (11-12): 1494-1505.
... welinite. American Mineralogist , 71 , 1522 –1526. Dunn, P.J., Francis, C.A., and Innes, J. ( 1988 ) A mcgovernite-like mineral and leucophoenicite from the Kombat mine, Namibia. American Mineralogist , 73 , 1182 –1185. Escher, A., Masson, H., and Steck, A. ( 1987 ) Coupes géologiques des...
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Journal Article
Published: 01 June 2019
Mineralogical Magazine (2019) 83 (3): 479-483.
... Zaccarini, Ulf Hålenius and Ferdinando Bosi *E-mail: cristian.biagioni@unipi.it Welinite group Trigonal: P 3; structure determined a  = 8.205(1), c  = 4.774(1) Å 3.105(s), 2.858(s), 2.676(ms), 2.332(ms), 1.787(s), 1.685(m), 1.552(m) Type material is deposited in the mineralogical...
Journal Article
Published: 01 October 2018
Mineralogical Magazine (2018) 82 (5): 1101-1118.
... (Moore and Ito, 1978 ; Cooper and Hawthorne, 2012 ), örebroite (Dunn et al ., 1986 ) and welinite (Moore, 1967 ). Here, I report the structures of mcgovernite and carlfrancisite and examine the similarities and differences between mcgovernite, carlfrancisite and turtmannite...
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Journal Article
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 653-658.
... Scortico Mn ore deposit, Fivizzano, Apuan Alps, Massa Carrara, Tuscany, Italy (44°07′39″N, 10°07′12″E) Cristian Biagioni*, Elena Bonaccorsi, Anthony R. Kampf, Federica Zaccarini, Ulf Hålenius and Ferdinando Bosi *E-mail: cristian.biagioni@unipi.it Welinite group Trigonal: P 3; structure determined...
Journal Article
Published: 01 October 2017
European Journal of Mineralogy (2017) 29 (5): 931-936.
...*, Aaron J. Celestian and Barbara P. Nash *E-mail: akampf@nhm.org Welinite group Trigonal: P 3; structure determined a  = 8.2139(10), c  = 4.8117(4) Å 3.994(34), 3.125(95), 2.858(56), 2.688(57), 2.349(81), 1.793(100), 1.669(23), 1.550(75) Cotype material is deposited...
Journal Article
Published: 01 October 2017
Mineralogical Magazine (2017) 81 (5): 1279-1286.
.... Celestian and Barbara P. Nash *E-mail: akampf@nhm.org Welinite group Trigonal: P 3; structure determined a  = 8.2139(10), c  = 4.8117(4) Å 3.994(34), 3.125(95), 2.858(56), 2.688(57), 2.349(81), 1.793(100), 1.669(23), 1.550(75) Cotype material is deposited in the mineralogical...
Journal Article
Published: 01 September 2006
European Journal of Mineralogy (2006) 18 (5): 569-582.
... ). A reinvestigation ( Ragu, 1990 ) revealed the presence of numerous additional, sometimes rare silicate species, such as helvite, hyalophane, humite-group Mn minerals, tinzenite, welinite, and of vanadium-rich phases such as the spinel vuorelainenite, an ‘allanite’ of unique composition to be described below...
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Journal Article
Published: 01 May 2000
American Mineralogist (2000) 85 (5-6): 873-877.
... occurs in veinlets, <2 mm wide in the holotype specimen, that variably also contain rhodochrosite, friedelite, welinite, barite, and other minerals. The veinlets cut Mn ores at the historic Pla de Labasse deposit near the hamlet of Nabias (hence the new mineral name). Formation of the veinlets...